Minecraft's adventure mode is about survival. Players are dropped, empty handed, into a vast, randomly generated world. Their first task is to make tools and shelter. Because when the sun sets the monsters come out. Players scrounge for wood and stone, craft a workbench and begin the gradual process of gearing up. Here is where Minecraft is most conventional – there's a rigid progression from building tools out of wood and stone to eventually mining diamonds, constructing working railroads and magical portals that can transport players to other dimensions. Once the player has built a workshop and a fortress to protect them from wandering zombies, spiders and Creepers the game tilts towards the creative. Players are free to proceed how the choose – they can gather resources, develop their base of operations or strike out into the world, looking for new adventure. It's this undirected freedom that keeps millions occupied.