Thank you for the response! I was going for games published even outside a JAM. I remember Pocket Monsters#1 (GameBoy) to have multiplayer, albeit the battles appeared to be a bonus to the main single player game. The previous year, I wrote as answer to a question that I was verifying using javascript for GAME OFF 2021; however, the sample outputs that I observed appeared to not yet reach GAMES executed on the Super Family Computer. A few months before GAME OFF 2022, I learned of another ITCH.IO JAM, the GAMEBOY SHOWDOWN, where the outputs of using javascript caused me to verify it and use the know-how in our team’s entry. Perhaps, we shall soon find a JAM with multiplayer, e.g. make a FIGHTING GAME in one month.
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Thanks! Here is the link to the GAMEBOY SHOWDOWN: https://itch.io/jam/game-boy-showdown