An all time classic, hands down, no doubt.
When you get into the game, you are surrounded by lush graphics, great gameplay, wonderful sound (in Win95 or lower) and a 4, 16, or 256 color pixelated babe. I got this game off a CD-rom that had about 25 shareware titles on it when I was 6, and I have been stuck to it ever since. Jill has 14 levels, and two bonus levels that are not too hard to get to. It has no bosses, no blood, no excessive violence, just pure platforming. It has interesting ideas (the elevators are very original, and the Pac-Man style ghosts are cool. Oh, and the crabs, alligators, huge floating eyes, birds that look like butterflies, frogs, bees, giant ants, and those little blue things that get in your way on the chains are nice, too). The music is so memorable I still remember it today. It even has a very nice Save feature. I have fond memories of sitting at my family's new 75 mhz Pentium Packard Bell PC with Win95 on it, and playing it for hours. And a year or two later I ordered the full version and discovered the frustration of the heck level with Jill Goes Underground, and the equally fun Jill Saves The Prince. I still play it (and beat it) today, and I never get sick of it. This is my favorite PC action game of all time, and always will be. Period.
The only negatives I can give about this game is that it will not run at all under a WinOS later than 98 SE (based on my personal experience, of course), which is a huge pain in the a** for all of us XP users, the Sound Blaster effects and music won't run under anything later than 95 (again, based on personal experience), and it is just a tad too easy, but that's probably just me after playing it for six years, not to mention that I've beat it several times.
The Bottom Line
If you have Windows 98 SE or lower, GET THIS GAME NOW. I don't care if it's the shareware version (which you can download just about anywhere) or the full version (you should get both), this game is an absolute PC platforming classic, and will live on forever in the history of video and PC games.