Use D and A for boxer1 to move and left and right and space to punch and right and left arrows for boxer2 to move and up arrow key to puch. They both have to keep touching to get the score. There may be some bugs.
I got the background from https://www.amazon.com/CSFOTO-Photogarphy-Wrestling-Background-Flashlight/dp/B07NPMQVTJ and the characters are made by me. No bad comments!
