Arkham Horror is based on the Cthulu Mythos of H.P. Lovecraft. If you don't know the genre just say your living your life in the old glory days then one day portals start openning up from other planes and in drop the monsters raising heck and driving people into the looney bin! Your object is to shut down the portals before something seriously big bad Monster comes in and ends the world! This is an awesome game as in it is fully cooperational. The players work together to win so it makes a good choice for playing with people who might be at a variety of game skill playing levels.