It feels like every secret from old games has been revealed. There is a secret mode on both Nintendo hardware and Nintendo's online service.

At the title, hold Y+R, then press A or START. Following screen will appear instead or regular menus. Here you can select any character to fight a free single match. See, even fighters from SPECIAL CIRCUIT are available here. -> pic.twitter.com/Hh7AtPdTcK

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The classic Super Nintendo Entertainment System boxing game uses two-button combinations, but there are undiscovered cheat codes. The two sound test and Japanese name input codes were already well-known, but he discovered two others that broke the retro gaming internet.

By holding Y+R on joypad 2 at the title screen and pressing A or Start on joypad 1 after, a screen featuring the game's various enemies can be seen. The screen lets players choose an opponent and fight them for free.

One player can control the enemy in this mode. To do this, you need to hold B+Y on joypad 2 and then press A or start on joypad 1. This is a dream come true for those that have dreamed of controlling their enemies. To find out what button inputs lead to the different specials, you have to do a bit of testing.

It worked just like the real hardware when people tried it on the Nintendo Switch Online port of Super Punch- Out!! It is a game that can be tried out for Switch Online subscribers.

There is a recommended video.