A nearly 30-year-old cheat code for Super Punch-Out that unlocks a hidden multiplayer mode was recently discovered. Using a complicated string of inputs in players 1 and 2’s controller ports, the players can eventually control the main character and a selected CPU to duke it out in this never-before-seen two-player mode!

To access this option, hold the ‘Y’ and ‘R’ buttons on the second player’s controller on the game’s start screen and then press ‘Start’ or the ‘A’ button on the first player’s controller. Select the boxer for player two and have the second player hold down the ‘B’ and ‘Y’ buttons on their controller until the match begins.

It is exciting because no special hardware, accessories, or hacks are required to access the hidden mode. So you should be able to test it yourself if you have a copy of the original game. Otherwise, you can test it out on the Switch Online service as Nintendo Life did.