Bubbles away!!
Your basically drawing out some random hidden drawing on a giant grid, while enemies are flying in your path. It's kind of like taking a driving test: make sure you don't hit the walls or--in most cases--the cones...and look out for pedestrians.
It's a bit hard to control Bubbles, since you have to press whatever direction you want to move in by holding that button so Bubbles can grab hold of a pole and swing in that direction.
The levels get a bit more challenging with springs blocking your way and Bubbles moves even faster; it makes it harder to grab hold of a pole you're trying to reach.
It's fun to play for a while, and even after quitting the game, you'll still want to come back to it a short time later...if you like grids.