Description taken from Game Boy version of this game

A quirky game with simple graphics yet diabolically challenging puzzles (which are at times time-consuming), Kwirk has players guiding Kwirk, the Chilled Tomato through a subterranean labyrinth, trying to get from room to room. To exit each room, players must roll pebbles, shove blocks and turn turnstiles. Two basic modes of play are available: Going Up, which involves escaping from as many rooms as possible, and Heading Out, which is a timed event involving a set number of rooms. Plus, there's a two-player mode via linkup, and, mercifully, a level select that enables players to continue from where they left off. ~ Brett Alan Weiss, All Game Guide