GORILLA.BAS: how to play the secret MS-DOS game from your childhood

Starting in 1991, every copy of MS-DOS (and many versions of Windows) included a hidden artillery game called Gorillas. It inspired a generation of programmers and drew the ire of computer lab instructors everywhere. Here's how it came to be-and how to play it today.

I played the hell out of this as a kid. Such a simple but fun game, and the fact so many people had no idea it existed made it all the more exciting, like we had some secret knowledge especially grownups weren't privy to.