Pocketgamer had an article about the game, that's how I learned about it today
Your only goal is to ensure that a clear path can be travelled from the top of the level to the bottom. You only have one minute to do so.
It starts off easy enough as you whiz through the levels in less than five seconds at a time. Later on, when you near the end of the 100 puzzles, you'll be cursing those time restrictions.
It's at its best when it makes you panic