Use arrow keys to move around the court. Press space to swing the racquet and hit the ball. Don't HOLD space - it will create a glitch in which Mario can't dive. This glitch may also be created if you press space way too early, or if you spam space. The hitboxes appear when you press space - sorry about that :/
Sprites and music belongs to Nintendo© Have Fun! Credit to another user who made the base of this; cant search them up right now, cuz I am on mobile...
