When the user ties with the computer, the game crashes no matter which difficulty level is selected. This however doesnt occur when the computer ties with the user. This game provides great entertainment for passing the time but unfortunately the most difficult level is actually quite predictable. No matter whos turn it is there are at least three scenarios that always guarantee a win. With that, the only ways to get a real challenge out of connect 4 is to play an online version, or with a real person. Note to developer: If I could have contacted you directly, I would have sent you this information personally without going public.