OK, OK, it may not make complete sense. In the end, the story doesn't much matter, what does are the puzzles. And they are pretty cool. There are a large number of puzzles which you play in order. Each world is comprised of four levels that are played in order.
Worlds share the same graphical look and sound effects.
To complete a level one of your Gruntz must bring a fragment of the warp stone to the fort where the Gruntz King is waiting. Collecting all four lets the Gruntz warp to the next world. Standing in your way are various obstacles. These include pits you can fall into and die, rolling boulders, and the bad Gruntz as well. To help you are tools, power-ups and toys.