Dungeon

Dungeon is a platform game where you control a white man running through a dungeon. On your way, you encounter typical platforming fare, like pits to leap over, deadly water, spikes and enemies.

The game was originally created as a "social experiment" (or, depending on how you see it, a mean prank), aimed at creating confusion among the players. The game experience was, secretly, different for each player. For some players nothing would be amiss, while others would suffer from a random odd symptom, such as: certain rooms (even the first one) being impossible to get through, the game working several times slower than normal, no checkpoints, different names of rooms, etc. Later on, v2.0 was released, removing the gameplay twist.