Good game but could use a minor improvement: It should remember the ID used to login to Game Center across sessions. I use a different Apple ID for Game Center and end up having to re-enter the credentials every time I run the app.

For anyone else who's as dense as I am - this is a slide puzzle game. What you see is what you get, nice, clear graphic, no bells and whistles.The puzzles are NOT easy, but what makes them difficult is not the puzzle itself, but trying to complete it in the number of moves given as "par". I was missing par more often than not even on the "easy" Kids stack - before I realized I was ON the easy kids stack and changed to the easy adult stack. Now I miss par by at least 5 moves on every puzzle. So the game IS a challenge, requiring concentration.I've only played it for a day or two - there seems to be many, many levels though, so unless you're some kind of genius is inspacial diagrams, it should provide a long time playing to get those pars.

lol the only challenging levels in this game are the more difficult ones, they crazy ones are the funnest.