Man do I wish I hadn't traded my ROB for some crappy games when I was a kid.
Would be a center stage piece for a room of doom.
Anyhow, you don't need the robot to play this game, just the second controller and 2 buttons on that controller.
Goofing around with it got me to lvl 20 out of 40. Then I got bored with it (again). Something about that music though. And squishing the green critters (Smicks). And squishing the professors. Can't forget the turnips either.
One of my favorite tricks was to set a turnip pixel perfect under a pillar, and have a smick come eat half of it (or less) and then bring the hammer down. It wouldn't smash the poor vegetable, but would turn that green death biter into something more manageable, like a pancake or a grease spot.
Give this game a whirl, the only things that sucked was that you couldn't jump, and that if you tried to play it the right way, it could have a chance at inducing seizures...