(Gaming Days) x 30^1337: Day 1 - Very First Video Game

So a bunch of people are doing that "30 Days of Gaming" thing; I guess I might as well, too.
 
Day 1 - Very first video game.
The first game I ever went out to a store and bought myself with my own money was Duke Nukem Manhattan Project.  A seriously underrated oldschool-style platformer, returning Duke to his 2D roots while maintaining all the stuff you'd expect from his games: gore, vulgarity, highly sexualized women, etc.

 Naturally it's not the first game I ever played, mind you.