Gemini blew the socks off of all my middle school friends, but I'm embarrassed by the amount of time I spent on Galaxian in math class. Maybe one of these days, I'll dig out my 83+ and complete the no laser, no death run that I was always aiming for, just for old time's sake.
In hindsight, I wish I had spent that time learning Z80 instead...
Unfortunately I never had a TI-89. Would've been awesome if I had one back in the day, and then test these games: http://www.ticalc.org/archives/files/fileinfo/405/40593.html and http://www.ticalc.org/archives/files/fileinfo/323/32318.html