Lots of infinitely spawning, randomly generated thingy areas that have randomly generated mobs in them, shown on the screen, with there being a 33% chance that it glitches, showing the wrong enemy, each enemy having a difficulty rating below the ooo picture of the mob, which is a number 1-10. the harder the enemies, the better the loot. The glitched enemies have an equal chance of being anything. You use the loot you find to conquer stronger areas (I don't know what to call them) and stay alive because of the hunger and thirst system