The good is that the game is free and not overrun with ads. All the levels also come with an option to see the solution, which is handy. Most of levels are doable with trial and error and thinking things out. The bad is that the game is portrait orientation (dislike that on the iPad). Some levels require precise timing to solve -- I REALLY hated those -- plus you can't skip a level. The level selection screen doesn't let you go back and pick a specific level (e.g., to replay 96, you have replay 93, 94, 95). That's needlessly annoying. I stuck with the game and finished most of the levels, so it really is fun, but ultimately I lost patience with it.