Basically its a survival/resource management game. You build tools/weapons, you chop wood, you mine for rocks & metals, you hunt and gather for food, etc. Obviously the more things you build the more skilled you get and can get more elaborate with the things you can make which goes further and further in helping you survive. There also enemies that come after you that you have to defend yourself against. I realize my description doesn't make it sound all that great but believe me, the game is very deceptively addictive.