The city's sewer system has become infested with monsters and a maintenance droid called LINDA has been sent down to but an end to it. As LINDA you will encounter different monsters on your travels through the sewers, some monsters will destroy you on sight while others will drain your power levels, good job there's extra lives and batteries scattered throughout the sewers.
During your travels you will encounter a giant slime monster and destroying this monster is your primary objective. Unfortunately your laser doesn't have any effect on it so you must collect eight grenades that are scattered around the sewers. Even more unfortunate is that you can only carry one grenade at a time.