Super Mario Bros. X - The greatest fan-made tribute to Super Mario of all time!
Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.
Mushroom Kingdom Fusion - A massive crossover Mario-esque fangame from way back, now back from the dead. Relive the nostalgia
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
Insanely Twisted Shadow Planet - In this 2D action adventure so damn twisted, explore unique environments and battle bizarre...