No documentation - you need a wiki to see how half of the mechanics work and what the items do. The devs were just too lazy to add that information in the game. DLC sections are generated in the game, but not available unless purchased. You'd travel for 10 minutes down a corridor only to be faced with a dead end unless you BUY THE DLC FOR $9.99!!!!! Pathetic and insulting behavior. Full of bugs too that the devs also don't bother fixing. Makes you wonder why you should bother purchasing the game instead of pirating it...
