Wolfenstein 3D created in LittleBigPlanet 2

Games that allow you to create other games aren't common, but that's one of the draws of LittleBigPlanet 2. The first game allowed you to make new levels and challenges to share with the world, but the sequel is much more ambitious; players can create nearly anything they want with the game's editing tools.

If you need proof, check out this recreation of Wolfenstein 3D, created in the game's beta. The effect is a little weird, but it looks very playable.