Here's an interesting one for you: ROM Check Fail
It's a simple "kill the enemies" game. You've played this very game before. But not quite like this. Every five seconds or so there's a random change in the game that you are playing. One moment you're jumping on Quix with Mario, the next you might be shooting Asteroids with Spy Hunter. The challenge lies in keeping up with the changes, and trying not to get yourself boxed in when a change might go very wrong (as an example Space Invaders Ship only goes left and right, so being on the same level as a bunch of Mushroom Men with that one is not good).
Fun for a few minutes, at least.
Edited By TPRJones on 1208141564