gamerule

Gamerule, or game rule, is a command feature in Minecraft that allows players and server administrators to adjust core gameplay mechanics for a world session. These rules affect how the game behaves in areas such as weather, daylight,Mob behavior, and item handling, enabling customized or challenge-oriented play.

In Minecraft, the command is generally issued as /gamerule <rule> [value]. A rule can be boolean (true or false) or integer, and most rules have a default value defined by the game. Providing a value changes the rule; omitting a value typically displays the current setting in many versions. The exact list of available rules can vary between Java Edition and Bedrock Edition, and certain servers or realms may impose restrictions.

Gamerules are world-scoped and persist with the save file. They can be adjusted during play without restarting the world, making them useful for experiments, events, or on-the-fly balancing. On servers, operators can apply rules to influence all players in the world, though some settings may be restricted by server permissions or host configuration.

Common examples of gamerules include:

- doDaylightCycle (boolean): whether the day-night cycle runs.

- doWeatherCycle (boolean): whether weather changes occur.

- keepInventory (boolean): whether players keep items on death.

- doMobSpawning (boolean): whether mobs spawn.

- doTileDrops (boolean): whether blocks drop items when broken.

- doFireTick (boolean): whether fire spreads and burns.

- randomTickSpeed (integer): rate of random block updates.

- maxEntityCramming (integer): maximum entities allowed per block space.

- spawnRadius (integer): distance from players where mobs can spawn.

Notes: the availability and naming of rules can differ by edition and version, and changing rules can impact performance and gameplay balance.