1. Demon's Souls
We really shouldn't have to explain Demon's Souls to you, but for those living under a rock that haven't somehow experienced its decidedly exquisite cocktail of pain and wonder, it's the spiritual precursor to Dark Souls, i.e. the origin of one of the nail-toughest RPGs ever made. Like its Dark brother, though, the genius of Demon's isn't that in how many times you'll die-and believe us, Demon's punishes to the hilt-but just how the game's design smartly respects you enough to learn from your mistakes. This cannot be stressed enough: Play this game.