This has got to win some kind of award for the most complete game implemented on the least-capable platform: Pac-Man for Excel. It's a complete, playable, faithful implementation of the arcade Pac-Man game, written in Excel macros, with pixels of the game displayed by changing the background colors of minutely-sized cells! I'm flabbergasted. I don't even know enough about scripting Excel to be able to read the code this guy has written.