I have the exact same problem here. I bought the game from the app store today, and I went on to play a couple of easy levels right away, then I closed down the game and started it a couple of hours later and I can't get through the difficulty screen, it crashes as soon as I choose easy. I can play medium and hard, but only at one occassion at each. Then when I close the game and try to play hard or medium again the same thing happens as with easy. So I reinstalled the game and went on to play, works like a charm.....until I close the game and start it again and try to play on a difficulty level I have tried before, then it crashes until I reinstall again. This is really frustrating when I have paid my hard earned money on something and it doesn't work, it makes the game completely unplayable so I have paid for nothing.

I am running the game on a Ipod touch 3G with the latest firmware.

Please do something about this.