Lawnmower (don't think lawnmower man, think actually mowing a lawn and getting killed by dogs) on the Commodore 64 with a brick 5.25inch floppy drive, the nerds of the day were in awe...
lol What a great question!!! My first game on a pc was Solitaire lol ) Cause my first computer had giant floppy discs and I was almost the coolest kid in town with the whole 2gb hard drive!!!
My first was Pacman. From the big floppy, disk you had to load it first on the computer. It was fun. Still is fun.
Warcraft: Orcs & Humans if I remember correctly. Somewhere around 95 when my older brother got his first computer.