What is your source on multiplayer games being more popular and prevalent than single player? Because a cursory search only turns up the opposite preference. You’re ignoring the parts of my argument that don’t suit you as well, like playing only with friends, so I don’t think you’re really being an honest interlocutor. That leads me to believe you are probably a player that bullies other players, which is why you’re so strongly anti-moderation.
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https://www.statista.com/statistics/259577/us-single-player-vs-multiplayer-frequency-among-gamers “According to an October 2022 survey of PC and console gamers in the United States, over half of respondents stated that they spent about 75 to 100 percent of their gaming time playing alone.”
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https://www.midiaresearch.com/blog/single-player-vs-multiplayer-a-generational-changing-of-the-guards-or-a-bifurcation-of-gamer-behaviours “57% of gamers prefer single-player over multiplayer games, compared to 22% who prefer multiplayer games. While the overall preference for the single player mode holds true across all age segments, the degree to which the single player mode is preferred differs significantly with age.”
Have you tried Itch.io? They have a lot of Gameboy and NES roms that are “Name your own price.” I don’t have any recommendations - I’ve just started poking around with homebrew roms myself.