Minetest
In the default game of Minetest, Minetest Game (MTG for short), players explore a 3D world made from cubic blocks. Players may discover and extract raw materials, craft tools and items, and build structures and landscapes. Players can change the game settings to fight computer-controlled "mobs", as well as cooperate with or compete against other players in the same world.  The game can be played with mods, which edits the gameplay.