I've always liked these types of puzzles. Of course it's got wormholes. It's almost obligatory for this type of 'slide 'em until they hit a wall' game.
Important: you must solve the puzzles within a certain number of moves.
Two things I'm not crazy about: the graphics move too slowly for my impatient self. Also, a lot of the levels are very easy. Though some have made me think twice and even thrice.
There are 200 levels and I've done 49 of them. Stuck on number 50.