Gorillas, on QBasic.

This game basically got me into programming, because you could easily edit the source code and then see how the game changed.

Same, though I didn't edit Gorillas itself. I played that as a kid, then later (c. 2000) in my Intro to Programming class in middle school, I cloned it in Pascal. I even randomly had it select a day or night background, with a randomly positioned sun or moon. Still think back on that fondly :)

haha nice!! Thanks, i will introduce that to my kids :) They will probably hate me...

QBasic Gorillas (gorilla.bas).

The only skyscraper game I remember was the one where you're flying a plane that's getting lower and lower and you have to bomb the scyscrapers before you crash into them.

Probably not a game that would get made today...