Before going out on their own, Core Design made something of a name for themselves programming a number of games in an immediately identifiable platform style - games like Switchblade, Rick Dangerous, er, Rick Dangerous II, and this. At first glance they can all be mistaken for one another, but Impossamole stands out from the crowd thanks to the fact that it's crap.
It's a classic mistake, but the game seems almost determined to fall uncomfortably between the twin stools of being a platform game and - of all things - a beat-'em-up. The baddies all require several good whacks from Monty Mole (the hero of the game) before they can be persuaded to clear off, and this makes the levels a real chore to progress through. My pet hate, the invisible danger syndrome makes a few unwelcome appearances too, and generally you'll see that a complete lack of imagination has been employed at almost every point.
Impossamole is slow and tedious and a bad buy at any price.