You are a rookie boxer taking on the World Video Boxing Association (WVBA). You must fight through the rounds of boxers, skipping left or right and jabbing the opponent with left and right hook combos.
The boxers come in a variety of shapes and sizes. Each boxer has a slightly different fighting style that you need to learn - but usually when the boxer's eyes flash, it's time to dodge and hit back. Pulling off combos increases your Power Bar, and when it's at full strength you can unleash a KO combo that will beat the opponent. If you are knocked down, however, you must tap the button to stand back up and reenter the fight.
This is the original Punch-Out!! game, predating the famous Mike Tyson version on the NES by a few years. The game was actually played using two screens, with the action taking place on the bottom screen, and the statistics and challenger information appearing on the top.