In Minecraft, players explore a procedurally generated, three-dimensional world with virtually infinite terrain made up of voxels. Players can discover and extract raw materials, craft tools and items, and build structures, earthworks, and machines. Depending on their chosen game mode, players can fight hostile mobs, as well as cooperate with or compete against other players. The game has two main modes; one being survival mode, where players must acquire resources to survive, and a creative mode where players have unlimited resources and the ability to fly. Several other game modes exist besides the two main ones, such as one that allows players to spectate others and one that plays identically to survival mode, but features permadeath. The game's large community also offers a wide variety of user-generated content, such as modifications, servers, skins, texture packs, and custom maps, which add new game mechanics and possibilities.