The classic game of falling pieces which are to be placed 'efficiently'. I got pretty good at a PC version, but (of course) grew frustrated that the game ran too fast. I was sure I could keep the game up almost indefinitely, if it were just a question of brainpower (not coordination). So...I taught the computer everything I knew how to do and let it play all by itself!
The PC version I played was called 'NYET' (something to do with copyrights, I think), so I started calling my version 'DA'. This ran on my home PC in 1990. I guess it would run a little faster now :-)
I actually assigned this as a project in my Math modelling class! (Some of us are shameless)
Tidbits picked up elsewhere:
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http://www.math.niu.edu/~rusin/uses-math/games/tetris/index.htmlLast modified 1998/11/10 by Dave Rusin, rusin@math.niu.edu