6. Eggmanland - Sonic Unleashed (Xbox 360)
http://www.youtube.com/watch?v=Mt-QvpjdLxQ With a lot of the horribly painful levels included on this list, a bunch of them - mainly the Mario ones - can be conquered if you're prepared to seriously hone your skills. At least they play fair. But some games don't care about things like that, one of which happens to be Sega's Sonic Unleashed. The culprit? "Eggmanland," which is kind of like getting sucked into a vortex in the middle of the night, stripped naked and beaten with soap-filled socks like that scene in Full Metal Jacket. It's kind of impossible to predict the storm that erupts within the confines of "Eggmanland" because the game never prepares you for it. At all. It throws you from one insanely difficult set-piece to another, not really bothering to let you, you know, breathe. The worst part is that it never ends. For your average gamer, you're looking at between 30 minutes and an hour to complete this thing. On the plus side, there's... Did I say plus side? No, there aren't any of those: sorry.