The problem is the 'power-ups' (aka cheats?): the ice cubes, bombs, and especially the teleports. They seem needed to solve some levels (at least for 3 stars completion), but because they are widely available (5 of each / level) they are completely overpowered. Why would you try to solve a level without them, when you can use them? It removes the incentive to actually solve the puzzles the hard way. It breaks the game. Shame.