Adventure represents the adventure game mode: Players with this game mode cannot edit the world (placing or breaking blocks).

Creative represents the creative game mode: Players with this game mode have infinite blocks and items and can break blocks instantly.

Spectator represents the spectator game mode: Players with this game mode cannot interact with the world and cannot be seen by other players.

Survival represents the survival game mode: Players with this game mode have limited supplies and can break blocks using only the right tools.

GameMode represents a game mode that may be assigned to a player.