A free program for Android, by 7804j.
"The longest game ever" is an artificial intelligence that can challenge you to play for hours at a time. It will become a real battle of wits and stamina, in which you will have to fight for victory. You can win by killing the opponent or by being defeated by him.
This challenge is so hard that no human has ever been able to finish it. But if you are skilled enough, you can have a chance to win, even if you are a beginner. The opponent is not a simple machine, but an intelligent opponent, with its own logic.
So you have to think and find a way to win.