MIGHTY JILL OFF... surprisingly enough, a jumptastic Time-Waster for both boys and girls
Essentially, Jill Off is a jumping game -- a platform jumping game. There are no moving floors and no side scrolling -- just platforms that you have to jump between. There are flames and spikes to avoid, and some crafty spider things, but that's it. In theory you are trying to get to the top of a tower, to appease the queen. Yes, this is a game with some very weird undertones, but it IS work safe, so don't worry!
My only real issue was that I couldn't turn the sound off -- you'll either love the NES-inspired music, or it'll irritate you after a few minutes. Either way, MIGHTY JILL OFF is well worth 5, 10, or even 15 minutes of your time. It's hard, though -- but don't give up! Die-hard Mario Bros. platform fanatics: this could be the best bit of jumping fun for the last 20 years.