Jetpack is a freeware strategy/platform game created by Adam Pedersen in 1993. While the actual game isn't really all that great, the built-in editor and the piles of fan-made levels are enough to warrant calling it a classic.

For more information, to download Jetpack, or to download a bunch of fanmade levels, head on over to the official wobsite. Or if you're interested in the currently under development sequel for it, go here.

If you're looking for a much better explanation of the game, over a hundred high quality levels, and/or some fun fan-made Graphics Modules, check out Zandor 12's Jetpack page.

While I have long since lost all solo projects and levels I've made for Jetpack, I have something far better. A 48 level monstrosity that Zandor 12, Surlent, and I spent 5 years working hard non-stop procrastinating on: Nevada Jones and the Questionable Bureaucracy