Play — Clientbound Packets#

The Play state is the long-lived gameplay protocol entered after the Login (and optional Configuration) state completes. It carries every server-to-client message related to world updates, entities, the player, the inventory, sound, chat, and so on. This page enumerates every clientbound Play packet in registration order — that order, defined by the call sequence of addPacket(...) in GameProtocols.CLIENTBOUND_TEMPLATE, is the wire packet ID starting at 0x00.

Common types referenced throughout this page are described in data-types. Heavily structured payloads (chunk data, entity metadata, slots, particles, text components, command graphs, recipe displays, registries, tags) link out to their dedicated reference pages.

Packet Index#

ID	Name
0x00	Bundle Delimiter
0x01	Add Entity
0x02	Animate
0x03	Award Stats
0x04	Block Changed Ack
0x05	Block Destruction
0x06	Block Entity Data
0x07	Block Event
0x08	Block Update
0x09	Boss Event
0x0A	Change Difficulty
0x0B	Chunk Batch Finished
0x0C	Chunk Batch Start
0x0D	Chunks Biomes
0x0E	Clear Titles
0x0F	Command Suggestions
0x10	Commands
0x11	Container Close
0x12	Container Set Content
0x13	Container Set Data
0x14	Container Set Slot
0x15	Cookie Request
0x16	Cooldown
0x17	Custom Chat Completions
0x18	Custom Payload
0x19	Damage Event
0x1A	Debug Block Value
0x1B	Debug Chunk Value
0x1C	Debug Entity Value
0x1D	Debug Event
0x1E	Debug Sample
0x1F	Delete Chat
0x20	Disconnect
0x21	Disguised Chat
0x22	Entity Event
0x23	Entity Position Sync
0x24	Explode
0x25	Forget Level Chunk
0x26	Game Event
0x27	Game Rule Values
0x28	Game Test Highlight Pos
0x29	Mount Screen Open
0x2A	Hurt Animation
0x2B	Initialize Border
0x2C	Keep Alive
0x2D	Level Chunk With Light
0x2E	Level Event
0x2F	Level Particles
0x30	Light Update
0x31	Login
0x32	Low Disk Space Warning
0x33	Map Item Data
0x34	Merchant Offers
0x35	Move Entity Pos
0x36	Move Entity Pos Rot
0x37	Move Minecart Along Track
0x38	Move Entity Rot
0x39	Move Vehicle
0x3A	Open Book
0x3B	Open Screen
0x3C	Open Sign Editor
0x3D	Ping
0x3E	Pong Response
0x3F	Place Ghost Recipe
0x40	Player Abilities
0x41	Player Chat
0x42	Player Combat End
0x43	Player Combat Enter
0x44	Player Combat Kill
0x45	Player Info Remove
0x46	Player Info Update
0x47	Player Look At
0x48	Player Position
0x49	Player Rotation
0x4A	Recipe Book Add
0x4B	Recipe Book Remove
0x4C	Recipe Book Settings
0x4D	Remove Entities
0x4E	Remove Mob Effect
0x4F	Reset Score
0x50	Resource Pack Pop
0x51	Resource Pack Push
0x52	Respawn
0x53	Rotate Head
0x54	Section Blocks Update
0x55	Select Advancements Tab
0x56	Server Data
0x57	Set Action Bar Text
0x58	Set Border Center
0x59	Set Border Lerp Size
0x5A	Set Border Size
0x5B	Set Border Warning Delay
0x5C	Set Border Warning Distance
0x5D	Set Camera
0x5E	Set Chunk Cache Center
0x5F	Set Chunk Cache Radius
0x60	Set Cursor Item
0x61	Set Default Spawn Position
0x62	Set Display Objective
0x63	Set Entity Data
0x64	Set Entity Link
0x65	Set Entity Motion
0x66	Set Equipment
0x67	Set Experience
0x68	Set Health
0x69	Set Held Slot
0x6A	Set Objective
0x6B	Set Passengers
0x6C	Set Player Inventory
0x6D	Set Player Team
0x6E	Set Score
0x6F	Set Simulation Distance
0x70	Set Subtitle Text
0x71	Set Time
0x72	Set Title Text
0x73	Set Titles Animation
0x74	Sound Entity
0x75	Sound
0x76	Start Configuration
0x77	Stop Sound
0x78	Store Cookie
0x79	System Chat
0x7A	Tab List
0x7B	Tag Query
0x7C	Take Item Entity
0x7D	Teleport Entity
0x7E	Test Instance Block Status
0x7F	Ticking State
0x80	Ticking Step
0x81	Transfer
0x82	Update Advancements
0x83	Update Attributes
0x84	Update Mob Effect
0x85	Update Recipes
0x86	Update Tags
0x87	Projectile Power
0x88	Custom Report Details
0x89	Server Links
0x8A	Waypoint
0x8B	Clear Dialog
0x8C	Show Dialog

0x00 - Bundle Delimiter#

Packet ID: 0x00 · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet; presence delimits a bundle.

Semantics. Sent twice by the server to bracket a group of packets the client should buffer and apply atomically on a single client tick. The opening delimiter starts the bundle, the closing delimiter flushes it. Used to keep multi-packet effects consistent (e.g. spawn entity + initial metadata + velocity).

0x01 - Add Entity#

Packet ID: 0x01 · State: Play · Bound To: Client

Field	Type	Notes
Entity ID	VarInt	Server-assigned numeric ID for this entity, used by every subsequent entity-targeted packet.
Entity UUID	UUID	Stable identifier; randomly generated for newly spawned entities.
Type	VarInt	Registry id into the minecraft:entity_type registry.
X / Y / Z	Double × 3	Spawn position in absolute world coordinates.
Velocity	LP Vec3	Initial velocity. Encoded via Vec3.LP_STREAM_CODEC (net.minecraft.network.LpVec3): a single 0x00 byte for zero, otherwise 6 bytes packing three 15-bit axes plus a 2-bit scale, optionally followed by a VarInt for the upper scale bits.
Pitch	Angle	Packed degrees (degrees * 256/360).
Yaw	Angle	Packed degrees.
Head Yaw	Angle	Packed degrees; relevant for mobs with an independent head.
Data	VarInt	Object-specific data: e.g. block state id for falling blocks, shooter entity id for projectiles. Meaning depends on Type.

Semantics. Sent when a non-player entity becomes visible to the client. Players are introduced via Player Info Update and entered into the world by their entry there. Velocity uses the low-precision Vec3.LP_STREAM_CODEC format (variable-length, 1 byte when zero, 6+ bytes otherwise) — not three signed shorts as in pre-1.21.7 protocols.

0x02 - Animate#

Packet ID: 0x02 · State: Play · Bound To: Client

Field	Type	Notes
Entity ID	VarInt	Target entity.
Animation	Unsigned Byte	0 swing main hand, 2 wake up, 3 swing off hand, 4 critical hit, 5 magic critical hit.

Semantics. Plays a one-shot first-person/third-person animation on the target entity.

0x03 - Award Stats#

Packet ID: 0x03 · State: Play · Bound To: Client

Field	Type	Notes
Count	VarInt	Number of statistic entries.
Entries	Array	Repeated count times, each (Stat Category VarInt, Stat Id VarInt, Value VarInt) per the Stat.STREAM_CODEC encoding.

Semantics. Delivers updated statistics totals for the player; usually sent in response to a client_command request_stats.

0x04 - Block Changed Ack#

Packet ID: 0x04 · State: Play · Bound To: Client

Field	Type	Notes
Sequence	VarInt	Mirrors the sequence field of a player block action; lets the client retire predicted block changes up to this id.

Semantics. Acknowledges block-modification predictions sent by the client and allows it to release client-side rollback state.

0x05 - Block Destruction#

Packet ID: 0x05 · State: Play · Bound To: Client

Field	Type	Notes
Entity ID	VarInt	Identifies the breaking entity (so its progress can be replaced or cleared).
Position	BlockPos	Block being broken.
Progress	Unsigned Byte	0–9 show the breaking overlay; values >= 10 clear the overlay.

Semantics. Drives the cracked-block overlay other players see while one player mines a block.

0x06 - Block Entity Data#

Packet ID: 0x06 · State: Play · Bound To: Client

Field	Type	Notes
Position	BlockPos	Location of the block entity.
Type	VarInt	Registry id into minecraft:block_entity_type.
NBT	NBT Compound	Block-entity-specific update tag (network-trusted compound).

Semantics. Updates the data of an existing block entity (sign text, beacon settings, etc.). The NBT layout depends on the type; see the corresponding block entity.

0x07 - Block Event#

Packet ID: 0x07 · State: Play · Bound To: Client

Field	Type	Notes
Position	BlockPos	Block whose event is being fired.
Action Id	Unsigned Byte	Block-specific action identifier (e.g. note block instrument, chest open).
Action Param	Unsigned Byte	Block-specific parameter (e.g. note pitch, viewer count).
Block Type	VarInt	Registry id into minecraft:block; a sanity check against the position.

Semantics. Fires a transient block-driven action visible to nearby clients (note block ping, chest lid animation, piston extension, beacon beam). Meaning of action/param is per-block.

0x08 - Block Update#

Packet ID: 0x08 · State: Play · Bound To: Client

Field	Type	Notes
Position	BlockPos	Block to update.
Block State Id	VarInt	Index into the global block-state palette.

Semantics. Replaces a single block. For multiple changes within one chunk section, see Section Blocks Update; for whole chunks, Level Chunk With Light.

0x09 - Boss Event#

Packet ID: 0x09 · State: Play · Bound To: Client

Field	Type	Notes
Boss Bar Id	UUID	Identifies the bar.
Operation	Enum (Byte)	0 ADD, 1 REMOVE, 2 UPDATE_PROGRESS, 3 UPDATE_NAME, 4 UPDATE_STYLE, 5 UPDATE_PROPERTIES.
Operation Body	Variant	Fields below depend on operation.

ADD body:

Field	Type	Notes
Name	Text Component	Bar title.
Progress	Float	0.0–1.0 filled fraction.
Color	Enum (VarInt)	PINK, BLUE, RED, GREEN, YELLOW, PURPLE, WHITE.
Overlay	Enum (VarInt)	PROGRESS, NOTCHED_6, NOTCHED_10, NOTCHED_12, NOTCHED_20.
Flags	Unsigned Byte	Bitfield: 0x01 darken sky, 0x02 boss music, 0x04 create world fog.

REMOVE body: empty. UPDATE_PROGRESS body: Progress (Float). UPDATE_NAME body: Name (Text Component). UPDATE_STYLE body: Color (Enum), Overlay (Enum). UPDATE_PROPERTIES body: Flags (Unsigned Byte) as in ADD.

Semantics. Manages a named boss bar visible to the player.

0x0A - Change Difficulty#

Packet ID: 0x0A · State: Play · Bound To: Client

Field	Type	Notes
Difficulty	Enum (Unsigned Byte)	0 PEACEFUL, 1 EASY, 2 NORMAL, 3 HARD.
Locked	Bool	If true, the client cannot change the difficulty.

Semantics. Synchronises the world difficulty and its lock state with the client.

0x0B - Chunk Batch Finished#

Packet ID: 0x0B · State: Play · Bound To: Client

Field	Type	Notes
Batch Size	VarInt	Number of chunks delivered in the just-finished batch.

Semantics. Marks the end of a batch of Level Chunk With Light packets. The client uses this together with Chunk Batch Start to estimate per-chunk decode cost and respond with a chunk_batch_received rate.

0x0C - Chunk Batch Start#

Packet ID: 0x0C · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet.

Semantics. Marks the beginning of a chunk batch; allows the client to time its decode.

0x0D - Chunks Biomes#

Packet ID: 0x0D · State: Play · Bound To: Client

Field	Type	Notes
Count	VarInt	Number of chunks in the update.
Chunks	Array	Repeated count times: (Chunk X Int, Chunk Z Int, Data Byte Array) where Data is the biome-only chunk payload (length-prefixed by VarInt, max 2 MiB).

Semantics. Refreshes only the biome layers of already-loaded chunks without replacing block data. See chunks for the biome palette layout.

0x0E - Clear Titles#

Packet ID: 0x0E · State: Play · Bound To: Client

Field	Type	Notes
Reset	Bool	If true, also resets fade-in/stay/fade-out timings to defaults.

Semantics. Hides any displayed title and subtitle; optionally restores default animation timings.

0x0F - Command Suggestions#

Packet ID: 0x0F · State: Play · Bound To: Client

Field	Type	Notes
Transaction Id	VarInt	Echoes the id from the corresponding command_suggestion request.
Start	VarInt	Index in the command string where the replacement begins.
Length	VarInt	Number of characters being replaced.
Count	VarInt	Number of suggestion entries.
Entries	Array	Repeated count times: (Text String, Has Tooltip Bool, Tooltip Text Component?).

Semantics. Server-side completion results for a player's tab-complete request.

0x10 - Commands#

Packet ID: 0x10 · State: Play · Bound To: Client

Field	Type	Notes
Nodes	Array	Brigadier command graph; each entry encodes flags, children indices, optional redirect, and per-type payload. See commands.
Root Index	VarInt	Index of the root node in Nodes.

Semantics. Synchronises the executable command graph available to the player. The client builds its parser/auto-completer from this.

0x11 - Container Close#

Packet ID: 0x11 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Id of the container to close (read via readContainerId).

Semantics. Forces the client to close a server-opened container window.

0x12 - Container Set Content#

Packet ID: 0x12 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Container window id.
State Id	VarInt	Server snapshot id; echoed by the next Container Click.
Items	Array of Slot	Full inventory contents in slot order.
Carried Item	Slot	Item currently held on the cursor.

Semantics. Sends a complete snapshot of an opened container; supersedes any prior partial updates.

0x13 - Container Set Data#

Packet ID: 0x13 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Container window id.
Property Id	Short	Container-specific property index (e.g. furnace progress).
Value	Short	New value of that property.

Semantics. Updates a single integer property of a container (furnace burn time, brewing fuel, beacon level, etc.).

0x14 - Container Set Slot#

Packet ID: 0x14 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Container window id; -1 for the carried item, -2 for the player's inventory.
State Id	VarInt	Server snapshot id.
Slot	Short	Index of the slot to overwrite.
Item	Slot	New stack contents.

Semantics. Updates a single inventory slot.

0x15 - Cookie Request#

Packet ID: 0x15 · State: Play · Bound To: Client

Field	Type	Notes
Key	Identifier	Cookie key the server wants the client to return.

Semantics. Asks the client to reply with a cookie_response containing the value previously stored under key (or empty if absent).

0x16 - Cooldown#

Packet ID: 0x16 · State: Play · Bound To: Client

Field	Type	Notes
Cooldown Group	Identifier	Cooldown bucket (typically an item id).
Duration	VarInt	Cooldown ticks remaining; 0 clears the cooldown.

Semantics. Greys out items sharing the cooldown group for the given number of ticks.

0x17 - Custom Chat Completions#

Packet ID: 0x17 · State: Play · Bound To: Client

Field	Type	Notes
Action	Enum (VarInt)	0 ADD, 1 REMOVE, 2 SET.
Entries	Array of String	Names to add/remove/replace in the chat completion list.

Semantics. Maintains the server-driven completion suggestions shown in the chat UI (typically online player names plus custom tokens).

0x18 - Custom Payload#

Packet ID: 0x18 · State: Play · Bound To: Client

Field	Type	Notes
Channel	Identifier	Plugin channel identifier.
Data	Byte Array	Channel-specific payload; total packet size capped at 1 MiB. The vanilla minecraft:brand payload uses a single UTF-8 string; otherwise the payload is opaque.

Semantics. Carries plugin-defined messages from server to client.

0x19 - Damage Event#

Packet ID: 0x19 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Entity that was damaged.
Source Type Id	VarInt	Registry id into minecraft:damage_type.
Source Cause Id	VarInt	Direct/indirect attacker id encoded as id + 1; 0 means none.
Source Direct Id	VarInt	Projectile / direct entity id encoded the same way.
Has Source Position	Bool	If true, position fields follow.
Source Position	Double × 3	Optional. Origin point of the damage.

Semantics. Notifies clients of a damage event so they can play the correct hurt animation, sounds and particles.

0x1A - Debug Block Value#

Packet ID: 0x1A · State: Play · Bound To: Client

Field	Type	Notes
Block Position	BlockPos	Subject block.
Update	Tagged Update	DebugSubscription.Update payload: subscription type id followed by type-specific data.

Semantics. Pushes a block-scoped debug data update to the F3 debug overlay; only sent to clients that subscribed via the debug subscription request.

0x1B - Debug Chunk Value#

Packet ID: 0x1B · State: Play · Bound To: Client

Field	Type	Notes
Chunk Position	ChunkPos	Subject chunk.
Update	Tagged Update	See Debug Block Value.

Semantics. Chunk-scoped debug data update for the debug overlay.

0x1C - Debug Entity Value#

Packet ID: 0x1C · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Subject entity.
Update	Tagged Update	Subscription-specific payload.

Semantics. Entity-scoped debug data update.

0x1D - Debug Event#

Packet ID: 0x1D · State: Play · Bound To: Client

Field	Type	Notes
Event	Tagged Event	DebugSubscription.Event payload: subscription type id followed by type-specific data.

Semantics. Generic non-targeted debug event for subscribed debug overlays.

0x1E - Debug Sample#

Packet ID: 0x1E · State: Play · Bound To: Client

Field	Type	Notes
Sample	Long Array	Sequence of Long values; the meaning depends on the sample type.
Sample Type	Enum (VarInt)	RemoteDebugSampleType, currently TICK_TIME.

Semantics. Sends a batched performance sample (e.g. tick durations) to the debug client.

0x1F - Delete Chat#

Packet ID: 0x1F · State: Play · Bound To: Client

Field	Type	Notes
Message Signature	Packed Signature	Either a 256-byte signature or a VarInt back-reference into the rolling signature cache (MessageSignature.Packed).

Semantics. Removes a previously displayed chat message identified by its signature reference.

0x20 - Disconnect#

Packet ID: 0x20 · State: Play · Bound To: Client

Field	Type	Notes
Reason	Text Component	Disconnect message; serialized via the trusted context-free codec.

Semantics. Closes the connection and shows the reason on the client's disconnection screen.

0x21 - Disguised Chat#

Packet ID: 0x21 · State: Play · Bound To: Client

Field	Type	Notes
Message	Text Component	Already-formatted message body.
Chat Type	Bound Chat Type	(Chat Type Holder, Sender Name Text Component, Optional Target Name Text Component) — see chat.

Semantics. Server-side chat message that should appear to come from a player but does not carry any signature; used by /say, /me and similar.

0x22 - Entity Event#

Packet ID: 0x22 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	Int	Target entity (note: 32-bit int, not VarInt).
Event Id	Byte	Entity-status code (e.g. 2 hurt animation, 3 death sound).

Semantics. Fires a status event on an entity; the meaning of Event Id is per entity class.

0x23 - Entity Position Sync#

Packet ID: 0x23 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target entity.
Position	Double × 3	Absolute X, Y, Z.
Delta	Double × 3	Velocity X, Y, Z.
Yaw	Float	Degrees.
Pitch	Float	Degrees.
On Ground	Bool	Whether the entity is grounded.

Semantics. Authoritative absolute-position sync for an entity (used to correct accumulated drift from delta-only updates). Uses the PositionMoveRotation codec.

0x24 - Explode#

Packet ID: 0x24 · State: Play · Bound To: Client

Field	Type	Notes
Center	Double × 3	Centre of the explosion.
Radius	Float	Effective explosion radius.
Block Count	Int	Number of blocks broken (used for particle weighting).
Has Player Knockback	Bool	Followed by Vec3 (3 doubles) if true.
Explosion Particle	Particle	Particle used at the centre.
Explosion Sound	Sound Holder	Inline SoundEvent (registry id, optional override).
Block Particles	Weighted List of Explosion Particle Info	Particles spawned per broken block, with weights.

Semantics. Notifies the client of an explosion at a point; drives sound, screen shake, particles and player knockback.

0x25 - Forget Level Chunk#

Packet ID: 0x25 · State: Play · Bound To: Client

Field	Type	Notes
Chunk Position	ChunkPos	Encoded as a single Long (x low 32 bits, z high 32 bits).

Semantics. Tells the client to unload a previously sent chunk.

0x26 - Game Event#

Packet ID: 0x26 · State: Play · Bound To: Client

Field	Type	Notes
Event	Unsigned Byte	Event id. Notable values: 0 no respawn block, 1 end raining, 2 begin raining, 3 change game mode, 4 win game, 5 demo event, 6 arrow hit player, 7 rain level change, 8 thunder level change, 9 puffer fish sting, 10 elder guardian appearance, 11 immediate respawn, 13 start waiting for chunks.
Param	Float	Event-specific parameter (e.g. game mode index).

Semantics. Generic, world-wide gameplay event for the receiving player.

0x27 - Game Rule Values#

Packet ID: 0x27 · State: Play · Bound To: Client

Field	Type	Notes
Values	Map of (GameRule ResourceKey, [String](./data-types#string))	Each entry is a registry resource key for a gamerule and its current value as a string.

Semantics. Sends the current value of every gamerule to the client (e.g. for the gamerule UI).

0x28 - Game Test Highlight Pos#

Packet ID: 0x28 · State: Play · Bound To: Client

Field	Type	Notes
Absolute Position	BlockPos	World-space position.
Relative Position	BlockPos	Test-instance-local position.

Semantics. Highlights a position in the world during gametest sessions.

0x29 - Mount Screen Open#

Packet ID: 0x29 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Window id.
Inventory Columns	VarInt	Width of the mount inventory in columns.
Entity Id	Int	Mount entity (note: 32-bit int).

Semantics. Opens the mount inventory screen (horse, llama, donkey...) for the given mount.

0x2A - Hurt Animation#

Packet ID: 0x2A · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Hurt entity.
Yaw	Float	Direction (degrees) the damage came from, used to tilt the model.

Semantics. Plays the directional knockback/hurt animation on the entity.

0x2B - Initialize Border#

Packet ID: 0x2B · State: Play · Bound To: Client

Field	Type	Notes
Center X	Double	World border centre X.
Center Z	Double	Centre Z.
Old Diameter	Double	Current diameter.
New Diameter	Double	Target diameter.
Lerp Time (ms)	VarLong	Milliseconds over which to interpolate to New Diameter.
Portal Boundary	VarInt	Absolute maximum coordinate (typically 29999984).
Warning Blocks	VarInt	Distance from border at which the red warning shader appears.
Warning Time	VarInt	Seconds-of-shrink threshold for the warning.

Semantics. Sets the full state of the world border in one packet on player join or respawn.

0x2C - Keep Alive#

Packet ID: 0x2C · State: Play · Bound To: Client

Field	Type	Notes
Id	Long	Random ping id; the client must echo it via keep_alive.

Semantics. Liveness probe. Must be answered within the server timeout (default 30 s) or the player is disconnected.

0x2D - Level Chunk With Light#

Packet ID: 0x2D · State: Play · Bound To: Client

Field	Type	Notes
Chunk X	Int
Chunk Z	Int
Chunk Data	Chunk Packet Data	Heightmaps NBT, block-state palette payload, block entities — see chunks.
Light Data	Light Update Packet Data	Sky/block light masks and arrays — see chunks.

Semantics. Delivers a full chunk plus its lighting in a single packet. Sent in batches bracketed by Chunk Batch Start / Chunk Batch Finished.

0x2E - Level Event#

Packet ID: 0x2E · State: Play · Bound To: Client

Field	Type	Notes
Event Id	Int	Numeric effect id (block break sound, smoke direction, etc.).
Position	BlockPos	Effect origin.
Data	Int	Event-specific parameter.
Global	Bool	If true, plays for all players regardless of distance.

Semantics. Plays a one-shot world effect (sound + particles) at a position.

0x2F - Level Particles#

Packet ID: 0x2F · State: Play · Bound To: Client

Field	Type	Notes
Override Limiter	Bool	If true, ignores the client particle-distance setting.
Always Show	Bool	If true, render even with reduced particle settings.
X / Y / Z	Double × 3	Spawn position.
Offset X / Y / Z	Float × 3	Random spread on each axis.
Max Speed	Float	Velocity scalar.
Count	Int	Number of particles to spawn.
Particle	Particle	Particle type plus per-type extra fields.

Semantics. Spawns particles at a world position. Particle-specific fields follow the type id (block/item/dust/etc.).

0x30 - Light Update#

Packet ID: 0x30 · State: Play · Bound To: Client

Field	Type	Notes
Chunk X	VarInt
Chunk Z	VarInt
Light Data	Light Update Packet Data	Sky/block light arrays + masks — see chunks.

Semantics. Updates only the light arrays of an already-loaded chunk (e.g. after block changes that altered light propagation).

0x31 - Login#

Packet ID: 0x31 · State: Play · Bound To: Client

Field	Type	Notes
Player Id	Int	Server-side entity id of the player.
Hardcore	Bool	Hardcore-mode flag.
Dimensions	Array of Identifier	Names of every world (ResourceKey<Level>) the player may visit.
Max Players	VarInt	Soft cap (display only).
View Distance	VarInt	Render distance in chunks.
Simulation Distance	VarInt	Simulation radius in chunks.
Reduced Debug Info	Bool	If true, hides certain F3 fields.
Show Death Screen	Bool	If false, players respawn immediately.
Limited Crafting	Bool	If true, recipe book unlocks gate crafting.
Common Spawn Info	Spawn Info	(Dimension Type Id VarInt, Dimension Name Identifier, Hashed Seed Long, Game Mode Byte, Previous Game Mode Byte, Is Debug Bool, Is Flat Bool, Death Location? (BlockPos+Identifier), Portal Cooldown VarInt, Sea Level VarInt).
Enforces Secure Chat	Bool	If true, the client requires signed chat.

Semantics. Initial world-info packet entering the Play state. Carries enough to instantiate the player entity and the local world.

0x32 - Low Disk Space Warning#

Packet ID: 0x32 · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet.

Semantics. Singleton warning that the local integrated server is running low on disk space; for vanilla single-player only.

0x33 - Map Item Data#

Packet ID: 0x33 · State: Play · Bound To: Client

Field	Type	Notes
Map Id	VarInt	Identifies which filled map to update.
Scale	Byte	Map scale (0–4).
Locked	Bool	True if locked with a glass pane.
Has Decorations	Bool	If true, a list of decorations follows.
Decorations	Array of MapDecoration	Optional. Each (Type VarInt, X Byte, Z Byte, Rotation Byte, Optional Display Name Text Component).
Has Color Patch	Bool	If true, a patch follows.
Color Patch	MapPatch	Optional. (Width Byte, Height Byte, X Byte, Z Byte, Pixels Byte Array).

Semantics. Updates the rendered image / decorations of a filled map item.

0x34 - Merchant Offers#

Packet ID: 0x34 · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Active trading window.
Trades	Array of MerchantOffer	Each offer encodes input items, output, uses, max uses, xp, special price, price multiplier and demand.
Villager Level	VarInt	1–5 (Novice…Master).
Villager Xp	VarInt	Total experience.
Show Progress	Bool	Whether to show the level-up bar.
Can Restock	Bool	True for villagers, false for wandering traders.

Semantics. Populates a villager / wandering-trader trade GUI.

0x35 - Move Entity Pos#

Packet ID: 0x35 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target entity.
Delta X	Short	(currentX*4096) - (prevX*4096).
Delta Y	Short	Same for Y.
Delta Z	Short	Same for Z.
On Ground	Bool	Whether the entity touches the ground.

Semantics. Position-only delta update. Each delta is limited to ±8 blocks; for larger movement, the server sends Teleport Entity.

0x36 - Move Entity Pos Rot#

Packet ID: 0x36 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Delta X / Y / Z	Short × 3	Same encoding as Move Entity Pos.
Yaw	Angle	Packed degrees.
Pitch	Angle	Packed degrees.
On Ground	Bool

Semantics. Combined position-and-rotation delta update.

0x37 - Move Minecart Along Track#

Packet ID: 0x37 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Minecart.
Lerp Steps	Array of MinecartStep	Each (Position Vec3, Movement Vec3, Yaw Float, Pitch Float, Weight Float).

Semantics. Server-driven smooth interpolation steps for the new minecart movement model.

0x38 - Move Entity Rot#

Packet ID: 0x38 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Yaw	Angle	Packed degrees.
Pitch	Angle	Packed degrees.
On Ground	Bool

Semantics. Rotation-only update for an entity that has not moved.

0x39 - Move Vehicle#

Packet ID: 0x39 · State: Play · Bound To: Client

Field	Type	Notes
Position	Double × 3	Absolute X, Y, Z.
Yaw	Float	Degrees.
Pitch	Float	Degrees.

Semantics. Server-corrected position/rotation for the vehicle the player is riding.

0x3A - Open Book#

Packet ID: 0x3A · State: Play · Bound To: Client

Field	Type	Notes
Hand	Enum (VarInt)	0 MAIN_HAND, 1 OFF_HAND.

Semantics. Opens the written-book GUI for the book held in the given hand.

0x3B - Open Screen#

Packet ID: 0x3B · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Newly assigned window id.
Type	VarInt	Registry id into minecraft:menu (chest, anvil, …).
Title	Text Component	Window title.

Semantics. Tells the client to open a container window of the given type.

0x3C - Open Sign Editor#

Packet ID: 0x3C · State: Play · Bound To: Client

Field	Type	Notes
Position	BlockPos	Sign block.
Is Front Text	Bool	True for front side, false for back.

Semantics. Opens the sign-editing UI for the given sign side.

0x3D - Ping#

Packet ID: 0x3D · State: Play · Bound To: Client

Field	Type	Notes
Id	Int	Echoed back via pong (note: 32-bit int, distinct from Keep Alive).

Semantics. Generic round-trip probe; commonly used by datapacks/plugins to measure latency.

0x3E - Pong Response#

Packet ID: 0x3E · State: Play · Bound To: Client

Field	Type	Notes
Time	Long	Server-supplied timestamp echoed in response to ping_request.

Semantics. Server-side reply to the client's status-style ping_request.

0x3F - Place Ghost Recipe#

Packet ID: 0x3F · State: Play · Bound To: Client

Field	Type	Notes
Container Id	VarInt	Crafting window.
Recipe Display	RecipeDisplay	Display data for the recipe (slot images and result) — see recipe display.

Semantics. Shows the ghost-item preview of a recipe in the crafting grid after the player clicks it in the recipe book.

0x40 - Player Abilities#

Packet ID: 0x40 · State: Play · Bound To: Client

Field	Type	Notes
Flags	Byte	Bitfield: 0x01 invulnerable, 0x02 flying, 0x04 may fly, 0x08 instant break (creative).
Flying Speed	Float	Speed multiplier while flying.
Walking Speed	Float	Field-of-view modifier base speed.

Semantics. Updates the player's god-mode/flight abilities and speed multipliers.

0x41 - Player Chat#

Packet ID: 0x41 · State: Play · Bound To: Client

Field	Type	Notes
Global Index	VarInt	Strictly increasing message index for the receiving client.
Sender	UUID	Sender's player UUID.
Index	VarInt	Per-sender chat index for ordering and validation.
Has Signature	Bool	If true, a 256-byte signature follows.
Signature	Byte[256]	Optional.
Body	SignedMessageBody.Packed	(Content String, Timestamp Long, Salt Long, Last-Seen Acks) — see chat.
Has Unsigned Content	Bool	If true, an alternative formatted form follows.
Unsigned Content	Text Component	Optional.
Filter Mask	FilterMask	(Type Enum, Bitset) indicating which characters were redacted.
Chat Type	Bound Chat Type	Decoration parameters — see chat.

Semantics. Carries a signed chat message and the metadata needed to verify it.

0x42 - Player Combat End#

Packet ID: 0x42 · State: Play · Bound To: Client

Field	Type	Notes
Duration	VarInt	Combat duration in ticks.

Semantics. Signals end of a combat episode (used by combat tracking only).

0x43 - Player Combat Enter#

Packet ID: 0x43 · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet.

Semantics. Signals start of a combat episode.

0x44 - Player Combat Kill#

Packet ID: 0x44 · State: Play · Bound To: Client

Field	Type	Notes
Player Id	VarInt	Killed player.
Message	Text Component	Death message.

Semantics. Drives the death screen overlay on the receiving client.

0x45 - Player Info Remove#

Packet ID: 0x45 · State: Play · Bound To: Client

Field	Type	Notes
Profile Ids	Array of UUID	Players to remove from the tab list and from the local player registry.

Semantics. Removes player entries from the client's player-list table.

0x46 - Player Info Update#

Packet ID: 0x46 · State: Play · Bound To: Client

Field	Type	Notes
Actions	Bitset (Byte)	Combination of ADD_PLAYER, INITIALIZE_CHAT, UPDATE_GAME_MODE, UPDATE_LISTED, UPDATE_LATENCY, UPDATE_DISPLAY_NAME, UPDATE_LIST_PRIORITY, UPDATE_HAT.
Entries	Array of Entry	For each entry: (UUID) followed, in Actions enum order, by the fields each chosen action requires.

Per-action payload:

• ADD_PLAYER: (Name String, Properties Array of (Name, Value, Optional Signature)).
• INITIALIZE_CHAT: optional (Session Id UUID, Public Key Expiry Long, Public Key Bytes, Key Signature Bytes).
• UPDATE_GAME_MODE: (Game Mode VarInt).
• UPDATE_LISTED: (Listed Bool).
• UPDATE_LATENCY: (Latency VarInt ms).
• UPDATE_DISPLAY_NAME: optional (Display Name Text Component).
• UPDATE_LIST_PRIORITY: (Priority VarInt).
• UPDATE_HAT: (Show Hat Bool).

Semantics. Atomically adds or updates one or more player-list entries.

0x47 - Player Look At#

Packet ID: 0x47 · State: Play · Bound To: Client

Field	Type	Notes
From Anchor	Enum (VarInt)	0 FEET, 1 EYES — origin point on the player.
Target X / Y / Z	Double × 3	Target position.
Is Entity	Bool	If true, two more fields follow.
Target Entity	VarInt	Optional. Entity to look at instead of the position.
To Anchor	Enum (VarInt)	Optional. Anchor on the target entity.

Semantics. Forces the player camera to face a position or entity (the /teleport ... facing command).

0x48 - Player Position#

Packet ID: 0x48 · State: Play · Bound To: Client

Field	Type	Notes
Teleport Id	VarInt	Echoed by the client's accept_teleportation.
Change	PositionMoveRotation	(Position Vec3, Delta Vec3, Yaw Float, Pitch Float).
Relatives	Bitset of Relative	Which fields are deltas instead of absolutes (X, Y, Z, Y_ROT, X_ROT, DELTA_X, DELTA_Y, DELTA_Z, ROTATE_DELTA).

Semantics. Authoritatively sets the player's position/rotation. The client must reply with accept_teleportation carrying the same id.

0x49 - Player Rotation#

Packet ID: 0x49 · State: Play · Bound To: Client

Field	Type	Notes
Yaw	Float	Degrees.
Relative Yaw	Bool	If true, yaw is added to the current value.
Pitch	Float	Degrees.
Relative Pitch	Bool	If true, pitch is added.

Semantics. Forces a rotation change on the player (relative or absolute per axis).

0x4A - Recipe Book Add#

Packet ID: 0x4A · State: Play · Bound To: Client

Field	Type	Notes
Entries	Array of Entry	Each (RecipeDisplayEntry contents, Flags Byte) where 0x01 shows a notification and 0x02 highlights the entry.
Replace	Bool	If true, the new list replaces the existing recipe book contents.

Semantics. Adds entries to (or replaces the contents of) the client recipe book — see recipe display.

0x4B - Recipe Book Remove#

Packet ID: 0x4B · State: Play · Bound To: Client

Field	Type	Notes
Recipe Ids	Array of RecipeDisplayId	Recipes to remove from the book.

Semantics. Removes recipes from the client recipe book.

0x4C - Recipe Book Settings#

Packet ID: 0x4C · State: Play · Bound To: Client

Field	Type	Notes
Book Settings	RecipeBookSettings	One (Open Bool, Filter Bool) pair per book type (Crafting, Furnace, Blast Furnace, Smoker).

Semantics. Synchronises per-book open/filter state with the client.

0x4D - Remove Entities#

Packet ID: 0x4D · State: Play · Bound To: Client

Field	Type	Notes
Entity Ids	VarInt Array (readIntIdList)	Entities to despawn from the client world.

Semantics. Removes one or more entities from the client.

0x4E - Remove Mob Effect#

Packet ID: 0x4E · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Affected entity.
Effect	VarInt	Registry id into minecraft:mob_effect.

Semantics. Cancels a mob effect on an entity (e.g. milk cured Poison).

0x4F - Reset Score#

Packet ID: 0x4F · State: Play · Bound To: Client

Field	Type	Notes
Owner	String	Score owner (player name or fake-player).
Has Objective	Bool	If true, an objective name follows.
Objective	String	Optional. Specific objective to reset; if absent, all of the owner's scores are reset.

Semantics. Removes one or all sidebar/objective scores for an owner.

0x50 - Resource Pack Pop#

Packet ID: 0x50 · State: Play · Bound To: Client

Field	Type	Notes
Has Id	Bool	If true, a UUID follows.
Pack Id	UUID	Optional. If present, removes that specific pack; otherwise pops all server-applied packs.

Semantics. Unloads previously-pushed server resource packs.

0x51 - Resource Pack Push#

Packet ID: 0x51 · State: Play · Bound To: Client

Field	Type	Notes
Id	UUID	Identifies the pack so it can be popped later.
Url	String	Pack download URL.
Hash	String	SHA-1 hash (40 chars) of the pack archive.
Required	Bool	If true, the client disconnects if the player declines.
Has Prompt	Bool	If true, a prompt component follows.
Prompt	Text Component	Optional. Custom prompt message.

Semantics. Asks the client to download and apply a server resource pack.

0x52 - Respawn#

Packet ID: 0x52 · State: Play · Bound To: Client

Field	Type	Notes
Common Spawn Info	Spawn Info	Same struct as in Login.
Data To Keep	Byte	Bitset: 0x01 keep attribute modifiers, 0x02 keep entity data, 0x03 keep all.

Semantics. Respawns the player into a (possibly different) dimension. Equivalent to sending Login again but reusing the existing entity.

0x53 - Rotate Head#

Packet ID: 0x53 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Yaw	Angle	New head yaw (packed degrees).

Semantics. Updates an entity's head rotation independently of its body yaw.

0x54 - Section Blocks Update#

Packet ID: 0x54 · State: Play · Bound To: Client

Field	Type	Notes
Section Position	Long	Packed SectionPos — chunk section X/Y/Z.
Records	Array of Long	Each Long packs `(BlockState << 12)

Semantics. Batches multiple block changes within one chunk section.

0x55 - Select Advancements Tab#

Packet ID: 0x55 · State: Play · Bound To: Client

Field	Type	Notes
Has Tab	Bool	If true, a tab id follows.
Tab	Identifier	Optional. Advancement tab to switch to.

Semantics. Forces the advancements GUI to display a particular tab (or none).

0x56 - Server Data#

Packet ID: 0x56 · State: Play · Bound To: Client

Field	Type	Notes
MOTD	Text Component	Server description.
Has Icon	Bool	If true, raw icon bytes follow.
Icon Bytes	Byte Array	Optional. PNG bytes of the favicon.

Semantics. Sends the server description / icon to the client (after the connection is established, distinct from status response).

0x57 - Set Action Bar Text#

Packet ID: 0x57 · State: Play · Bound To: Client

Field	Type	Notes
Text	Text Component	Action-bar message.

Semantics. Displays a temporary message above the hotbar.

0x58 - Set Border Center#

Packet ID: 0x58 · State: Play · Bound To: Client

Field	Type	Notes
Center X	Double
Center Z	Double

Semantics. Updates the world border centre.

0x59 - Set Border Lerp Size#

Packet ID: 0x59 · State: Play · Bound To: Client

Field	Type	Notes
Old Diameter	Double	Current diameter.
New Diameter	Double	Target diameter.
Lerp Time	VarLong	Milliseconds over which to interpolate.

Semantics. Smoothly resizes the world border.

0x5A - Set Border Size#

Packet ID: 0x5A · State: Play · Bound To: Client

Field	Type	Notes
Diameter	Double	New border diameter, applied immediately.

Semantics. Snap-resizes the world border.

0x5B - Set Border Warning Delay#

Packet ID: 0x5B · State: Play · Bound To: Client

Field	Type	Notes
Warning Time	VarInt	Seconds until shrink at which the warning triggers.

Semantics. Configures the time-based border warning threshold.

0x5C - Set Border Warning Distance#

Packet ID: 0x5C · State: Play · Bound To: Client

Field	Type	Notes
Warning Blocks	VarInt	Distance from the border (in blocks) for the warning shader.

Semantics. Configures the distance-based border warning threshold.

0x5D - Set Camera#

Packet ID: 0x5D · State: Play · Bound To: Client

Field	Type	Notes
Camera Entity Id	VarInt	Entity whose POV the player views; the player's own id resets to first-person.

Semantics. Switches the player's view to another entity (used by spectator mode and /spectate).

0x5E - Set Chunk Cache Center#

Packet ID: 0x5E · State: Play · Bound To: Client

Field	Type	Notes
Chunk X	VarInt
Chunk Z	VarInt

Semantics. Tells the client the new centre chunk for its loaded-chunk square (used to evict stale chunks).

0x5F - Set Chunk Cache Radius#

Packet ID: 0x5F · State: Play · Bound To: Client

Field	Type	Notes
View Distance	VarInt	Server-imposed view distance in chunks.

Semantics. Updates the client's effective view distance.

0x60 - Set Cursor Item#

Packet ID: 0x60 · State: Play · Bound To: Client

Field	Type	Notes
Contents	Slot	New stack on the cursor.

Semantics. Updates the item the player is dragging on the cursor independently of any container.

0x61 - Set Default Spawn Position#

Packet ID: 0x61 · State: Play · Bound To: Client

Field	Type	Notes
Respawn Data	RespawnData	(Position BlockPos, Angle Float) indicating world spawn / compass target.

Semantics. Updates the world's default spawn point (also sets the compass target).

0x62 - Set Display Objective#

Packet ID: 0x62 · State: Play · Bound To: Client

Field	Type	Notes
Slot	VarInt	Display slot id (0 list, 1 sidebar, 2 below name, 3–18 team-coloured sidebars).
Objective Name	String	Empty string clears the slot.

Semantics. Selects which scoreboard objective is rendered in a particular display slot.

0x63 - Set Entity Data#

Packet ID: 0x63 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Metadata	Entity Metadata	Sequence of (Index Byte, Type VarInt, Value) triplets terminated by index 0xFF. See entity-metadata.

Semantics. Updates one or more synced data values on an entity (pose, health, custom name, etc.).

0x64 - Set Entity Link#

Packet ID: 0x64 · State: Play · Bound To: Client

Field	Type	Notes
Source Entity Id	Int	Leashed entity (32-bit int).
Destination Entity Id	Int	Holder; 0 clears the leash.

Semantics. Sets / clears the leash link between two entities.

0x65 - Set Entity Motion#

Packet ID: 0x65 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Velocity	LP Vec3	Encoded via Vec3.LP_STREAM_CODEC, identical to Add Entity.

Semantics. Sets the entity velocity directly.

0x66 - Set Equipment#

Packet ID: 0x66 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Slots	Variable Array	Each entry is (Slot Byte, Item Slot); the high bit (0x80) of Slot indicates more entries follow. Slot lo-bits encode the equipment slot ordinal (main hand, off hand, feet, legs, chest, head, body, saddle).

Semantics. Updates one or more equipment slots on an entity in a single packet.

0x67 - Set Experience#

Packet ID: 0x67 · State: Play · Bound To: Client

Field	Type	Notes
Experience Bar	Float	0.0–1.0 filled fraction.
Experience Level	VarInt
Total Experience	VarInt	Lifetime XP, used for the death drop calculation.

Semantics. Updates the experience HUD.

0x68 - Set Health#

Packet ID: 0x68 · State: Play · Bound To: Client

Field	Type	Notes
Health	Float	0.0–max-health hit points.
Food	VarInt	0–20.
Saturation	Float	0.0–5.0.

Semantics. Updates the health/food/saturation HUD.

0x69 - Set Held Slot#

Packet ID: 0x69 · State: Play · Bound To: Client

Field	Type	Notes
Slot	VarInt	0–8 hotbar index.

Semantics. Forces the active hotbar slot on the client.

0x6A - Set Objective#

Packet ID: 0x6A · State: Play · Bound To: Client

Field	Type	Notes
Objective Name	String	Identifier.
Method	Byte	0 add, 1 remove, 2 change.
Display Name	Text Component	Present for add/change.
Render Type	Enum (VarInt)	0 INTEGER, 1 HEARTS. Present for add/change.
Has Number Format	Bool	Present for add/change.
Number Format	NumberFormat	Optional. Tagged variant: BLANK / STYLED (Style) / FIXED (Text Component).

Semantics. Creates, removes or modifies a scoreboard objective.

0x6B - Set Passengers#

Packet ID: 0x6B · State: Play · Bound To: Client

Field	Type	Notes
Vehicle Entity Id	VarInt
Passenger Entity Ids	VarInt Array	All passengers, in seating order.

Semantics. Sets the full passenger list of a vehicle.

0x6C - Set Player Inventory#

Packet ID: 0x6C · State: Play · Bound To: Client

Field	Type	Notes
Slot	VarInt	Player inventory slot index.
Contents	Slot	New stack.

Semantics. Slim alternative to Container Set Slot for the player's own inventory; does not require an open container.

0x6D - Set Player Team#

Packet ID: 0x6D · State: Play · Bound To: Client

Field	Type	Notes
Team Name	String	Identifier.
Method	Byte	0 create, 1 remove, 2 update info, 3 add players, 4 remove players.
Parameters	TeamParameters	Present for create / update info. (Display Name TC, Friendly Flags Byte, Visibility String[40], Collision Rule String[40], Team Color Enum, Prefix TC, Suffix TC).
Players	Array of String	Present for create / add / remove. List of player names or fake-player ids.

Semantics. Manages scoreboard teams (membership and display).

0x6E - Set Score#

Packet ID: 0x6E · State: Play · Bound To: Client

Field	Type	Notes
Owner	String	Player or fake-player.
Objective Name	String	Objective being updated.
Value	VarInt	New score.
Has Display Name	Bool	Optional override.
Display Name	Text Component	Optional.
Has Number Format	Bool
Number Format	NumberFormat	Optional.

Semantics. Sets a scoreboard score, optionally with a per-entry custom display.

0x6F - Set Simulation Distance#

Packet ID: 0x6F · State: Play · Bound To: Client

Field	Type	Notes
Distance	VarInt	Simulation radius in chunks.

Semantics. Updates the simulation-distance value previously sent in Login.

0x70 - Set Subtitle Text#

Packet ID: 0x70 · State: Play · Bound To: Client

Field	Type	Notes
Text	Text Component	Subtitle.

Semantics. Sets the subtitle of the next title; queue with Set Title Text and Set Titles Animation.

0x71 - Set Time#

Packet ID: 0x71 · State: Play · Bound To: Client

Field	Type	Notes
Game Time	Long	Total ticks the world has run.
Clock Updates	Map	Map<Holder<WorldClock>, ClockNetworkState>: per-clock state (e.g. day clock with (time-of-day Long, scale Float, frozen Bool)).

Semantics. Synchronises wall-clock and per-dimension clocks (day/night, the End clock, etc.).

0x72 - Set Title Text#

Packet ID: 0x72 · State: Play · Bound To: Client

Field	Type	Notes
Text	Text Component	Title text.

Semantics. Sets the main title; pair with Set Subtitle Text and Set Titles Animation, then trigger via the next title display.

0x73 - Set Titles Animation#

Packet ID: 0x73 · State: Play · Bound To: Client

Field	Type	Notes
Fade In	Int	Ticks.
Stay	Int	Ticks.
Fade Out	Int	Ticks.

Semantics. Sets the timings for upcoming title displays.

0x74 - Sound Entity#

Packet ID: 0x74 · State: Play · Bound To: Client

Field	Type	Notes
Sound	Sound Holder	(Registry Id VarInt, Optional Override (Identifier + Optional Range Float)).
Source	Enum (VarInt)	Sound category (MASTER, MUSIC, RECORDS, WEATHER, BLOCKS, HOSTILE, NEUTRAL, PLAYERS, AMBIENT, VOICE, UI).
Entity Id	VarInt	Source entity.
Volume	Float	Multiplier.
Pitch	Float	0.5–2.0.
Seed	Long	Used to deterministically pick variants.

Semantics. Plays a sound attached to an entity (so it tracks if the entity moves).

0x75 - Sound#

Packet ID: 0x75 · State: Play · Bound To: Client

Field	Type	Notes
Sound	Sound Holder	See Sound Entity.
Source	Enum (VarInt)	Sound category.
Position X	Int	floor(x * 8).
Position Y	Int	floor(y * 8).
Position Z	Int	floor(z * 8).
Volume	Float
Pitch	Float
Seed	Long

Semantics. Plays a sound at a fixed world position with eighth-block accuracy.

0x76 - Start Configuration#

Packet ID: 0x76 · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet.

Semantics. Terminal packet that asks the client to leave Play and re-enter the Configuration state. The client must reply with configuration_acknowledged.

0x77 - Stop Sound#

Packet ID: 0x77 · State: Play · Bound To: Client

Field	Type	Notes
Flags	Byte	0x01 source present, 0x02 sound id present.
Source	Enum (VarInt)	Optional. Source category to silence.
Sound Id	Identifier	Optional. Specific sound to stop.

Semantics. Stops sounds matching the given filter; with no flags set, stops all sounds.

0x78 - Store Cookie#

Packet ID: 0x78 · State: Play · Bound To: Client

Field	Type	Notes
Key	Identifier	Cookie key.
Payload	Byte Array	Up to 5120 bytes; persisted by the client across sessions/transfers.

Semantics. Asks the client to persist a small key/value pair for later retrieval via Cookie Request.

0x79 - System Chat#

Packet ID: 0x79 · State: Play · Bound To: Client

Field	Type	Notes
Content	Text Component	Message body.
Overlay	Bool	If true, render in the action-bar slot instead of the chat window.

Semantics. Server-side, unsigned chat message (no sender identity).

0x7A - Tab List#

Packet ID: 0x7A · State: Play · Bound To: Client

Field	Type	Notes
Header	Text Component	Top of the player list.
Footer	Text Component	Bottom of the player list.

Semantics. Sets the per-player header/footer of the tab list.

0x7B - Tag Query#

Packet ID: 0x7B · State: Play · Bound To: Client

Field	Type	Notes
Transaction Id	VarInt	Echoes the request's transaction id.
Tag	NBT Compound (nullable)	Resulting NBT, or null if none.

Semantics. Reply to a data get-style block-entity / entity NBT query.

0x7C - Take Item Entity#

Packet ID: 0x7C · State: Play · Bound To: Client

Field	Type	Notes
Item Entity Id	VarInt	Item being picked up.
Player Entity Id	VarInt	Picker.
Amount	VarInt	Number of items collected.

Semantics. Plays the pickup animation/sound (item flies into the player). The actual entity removal still arrives via Remove Entities.

0x7D - Teleport Entity#

Packet ID: 0x7D · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Change	PositionMoveRotation	(Position Vec3, Delta Vec3, Yaw Float, Pitch Float).
Relatives	Bitset of Relative	See Player Position.
On Ground	Bool

Semantics. Authoritative absolute teleport for any entity.

0x7E - Test Instance Block Status#

Packet ID: 0x7E · State: Play · Bound To: Client

Field	Type	Notes
Status	Text Component	Human-readable status.
Has Size	Bool	If true, three VarInts (Vec3i) follow.
Size	Vec3i	Optional. Size of the test instance bounding box.

Semantics. Reports the status of the gametest instance block to the editing player.

0x7F - Ticking State#

Packet ID: 0x7F · State: Play · Bound To: Client

Field	Type	Notes
Tick Rate	Float	Server ticks per second (default 20).
Is Frozen	Bool	If true, world ticks are paused.

Semantics. Updates the client's view of the server tick clock (/tick rate, /tick freeze).

0x80 - Ticking Step#

Packet ID: 0x80 · State: Play · Bound To: Client

Field	Type	Notes
Tick Steps	VarInt	Number of steps to advance while frozen.

Semantics. Advances the frozen world by N ticks (/tick step).

0x81 - Transfer#

Packet ID: 0x81 · State: Play · Bound To: Client

Field	Type	Notes
Host	String	Target server hostname.
Port	VarInt	Target server port.

Semantics. Asks the client to seamlessly reconnect to another server while preserving stored cookies.

0x82 - Update Advancements#

Packet ID: 0x82 · State: Play · Bound To: Client

Field	Type	Notes
Reset	Bool	If true, the client clears its advancement set first.
Added	Array of AdvancementHolder	New / updated advancements (id, parent?, display?, requirements, sends_telemetry_event).
Removed	Array of Identifier	Advancement ids to delete.
Progress	Map of (Identifier, AdvancementProgress)	Per-criterion completion timestamps.
Show Advancements	Bool	Whether to show the advancement screen.

Semantics. Synchronises the client advancements view.

0x83 - Update Attributes#

Packet ID: 0x83 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Attributes	Array of AttributeSnapshot	Each (Attribute Holder, Base Value Double, Modifiers Array) where each modifier is (Identifier, Amount Double, Operation Enum (ADD / MULTIPLY_BASE / MULTIPLY_TOTAL)).

Semantics. Updates the entity's attribute base values and active modifiers (max health, movement speed, etc.).

0x84 - Update Mob Effect#

Packet ID: 0x84 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Target.
Effect	VarInt	Registry id into minecraft:mob_effect.
Amplifier	VarInt	Effect level minus one (0 = level I).
Duration	VarInt	Ticks remaining; -1 = infinite.
Flags	Byte	0x01 ambient, 0x02 show particles, 0x04 show icon, 0x08 blend.

Semantics. Applies or refreshes a mob effect on an entity.

0x85 - Update Recipes#

Packet ID: 0x85 · State: Play · Bound To: Client

Field	Type	Notes
Item Sets	Map of (Property Set Key, Property Set)	Per-property recipe input sets (e.g. furnace fuels, smithing templates).
Stonecutter Recipes	SelectableRecipe.SingleInputSet	Special list of (input Ingredient, display) pairs for the stonecutter UI.

Semantics. Sends the recipe property data needed for the recipe-driven UIs. Recipe display data is sent separately via Recipe Book Add.

0x86 - Update Tags#

Packet ID: 0x86 · State: Play · Bound To: Client

Field	Type	Notes
Tags	Map	Map<Registry ResourceKey, NetworkPayload> where each NetworkPayload is Map<Tag Identifier, Array of VarInt registry ids>. See tags.

Semantics. Synchronises every tag in every registry with the client.

0x87 - Projectile Power#

Packet ID: 0x87 · State: Play · Bound To: Client

Field	Type	Notes
Entity Id	VarInt	Projectile (typically a wind charge).
Acceleration Power	Double	Server-driven acceleration magnitude.

Semantics. Adjusts the per-tick acceleration of a server-managed projectile.

0x88 - Custom Report Details#

Packet ID: 0x88 · State: Play · Bound To: Client

Field	Type	Notes
Details	Map of (String, String)	Up to 32 entries; keys ≤ 128 chars, values ≤ 4096 chars.

Semantics. Extra fields the client should include in any local crash report it generates while connected.

0x89 - Server Links#

Packet ID: 0x89 · State: Play · Bound To: Client

Field	Type	Notes
Links	Array of UntrustedEntry	Each (Label Variant, Url String). The label variant is either a known type id (Bug Report, Community Guidelines, Support, Status, Feedback, Community, Website, Forums, News, Announcements) or a custom Text Component.

Semantics. Populates the server-supplied links shown in the pause menu and the disconnection screen.

0x8A - Waypoint#

Packet ID: 0x8A · State: Play · Bound To: Client

Field	Type	Notes
Operation	Enum (VarInt)	0 TRACK, 1 UNTRACK, 2 UPDATE.
Waypoint	TrackedWaypoint	Tagged variant: empty (untrack), (Position Vec3i, Icon), (Chunk ChunkPos, Icon), or (Azimuth Float, Icon). Each variant carries a UUID identifier and the icon (style id + optional color int).

Semantics. Adds, updates or removes a tracked waypoint marker on the player's HUD.

0x8B - Clear Dialog#

Packet ID: 0x8B · State: Play · Bound To: Client

Field	Type	Notes
(none)	—	Marker packet.

Semantics. Closes any server-shown dialog window currently open on the client.

0x8C - Show Dialog#

Packet ID: 0x8C · State: Play · Bound To: Client

Field	Type	Notes
Dialog	Holder of Dialog	Either a registry reference (id 0 + VarInt registry index minus one) or an inline definition (id 0 then 0-byte then full Dialog NBT/codec data). The inline definition encodes the dialog type and per-type body (notice, confirmation, multi-action, server-links, dialog-list).

Semantics. Opens a dialog screen on the client; user input flows back via the corresponding custom_click_action serverbound packet.

Source: net/minecraft/network/protocol/game/GameProtocols.java and the corresponding Clientbound*Packet.java files in the same directory.