Adventure

Adventure mode is a game mode intended for player-created maps, limiting some of the gameplay in Minecraft. In this mode, the player cannot directly destroy any blocks with any tools or place any blocks, in order to avoid spoiling adventure maps or griefing servers. Adventure mode is only accessible with commands.

Gameplay
Adventure mode is similar to Survival in that players receive damage from their environment, dying is possible, and players must manage hunger. However, it is different in many ways as well. In the Java Edition, blocks can only be destroyed with an item/tool that has the CanDestroy NBT tag, and cannot be destroyed by the player's fist. Likewise, blocks require the CanPlaceOn NBT tag to be placed. In the Bedrock Edition, blocks cannot be directly placed or destroyed by the player, regardless of which tool they are holding.

However, players are able to make use of the environment in other ways - including interacting with mobs and other entities (for example, killing them), turning a redstone mechanism (such as a lever) on or off, and trading with villagers. Additionally, players are able to craft items as they normally would in any other game mode. Another feature is that players will always spawn exactly on the world spawn point, no matter where it is - unlike Survival mode, where players can spawn anywhere within a certain grid.

Custom Minecraft maps make good use of Adventure Mode, and you will find that many custom maps are set to this game mode; players cannot break blocks or place them, therefore disallowing them to destroy the map, or add anything to it that would ruin the map. Also, it is often used to protect various multiplayer servers from griefers. Command blocks are usually used in conjunction with Adventure Mode, in servers and custom maps

Players with the ability worldbuilder set to true can break and place blocks freely on Adventure Mode.

A player can switch to Adventure mode from any other game mode by using the commands when cheats are enabled.