Save game state!
15 app updates and this still doesnt have the most basic function to allow you to pick up where you left off mid-puzzle? This would be a five star game with that minor problem fixed. The later levels can take 15-20 minutes each. Getting 12 of 18 solved, walking away, and coming back to a clean slate is infuriating.
Chmeeee about
Alpha Omega, v2.9