Caution!! This may be the most hardest, irritating, frustrating game EVER. If you tend to exasperate often, I recommend you not play this game. It will literally drive you insane. I PROMISE. Compatible with iPhone 4 and above, iPod touch 4th Generation and above, iPad 2 and above. Other devices have not been tested. -"Last Change Mode" is FREE! -You have only once chance to try. -As long as you don't fail, you can continue to play the game. -You have 10 chances to clear "Normal Mode". As written above, this game is VERY STRESSFUL. You may get so irritated and frustrated that you throw your phone out the window. I can't take any responsibilities for the displeasure this game may cause. Even after reading this you are still eager to play the game, then go ahead. Good luck.