28 years on, a secret versus mode is discovered in Nintendo's Super Punch-Out

Super Punch-Out is a very old-school boxing game released for the Super NES in 1994. Coming late in the system's life cycle, it was overshadowed by its Mike Tyson-branded predecessor and by a new generation of fighting games such as Street Fighter II. Now, 28 years on, a hidden two-player versus mode has been discovered. Unlisted Cheats:

The trick works on the Switch version, too: