I wonder if anyone remembers the good old days where you could link two Nintendo Gameboys and play tetris against each other. Now, I wonder if you can make this AI play against itself, and use machine learning to 'teach' itself to play best, instead of using a rule-based system like this?
After mentioning this on Freenode #emacs, I was tipped about the following trick as well: M-x finder-by-keyword and select "games".
This isn't even an easter-egg. This is a basket full of them! Emacs is amazing!