Super Mario 64: Has a vibrant speedrunning, modding, and analyst community.
Super Mario Maker 2: Great game you can use to build binary computers. Best enjoyed in an emulator.
The Legend of Zelda: Majora's Mask, Ocarina of Time, Wind Waker, and a Link to the Past are the only good ones. Everything else is kind of meh. (Yes, including the "critically acclaimed" Breath of the Wild) Also, I hate the supposedly canon timeline.
Minecraft: The game that peaked in 2012 and gets worse with every new update. exozyme intermittently runs a server. PKGBUILD for Arch Linux.
FlightGear: Really, really hard but ultra-realistic flight simulator game. Just try landing any plane. Open source too!
Mother 3: One of the best RPGs out there. As always, the battle system kind of sucks. Also, there's animal abuse.
The Powder Toy: Great sandbox game, a bit like Minecraft but better in some ways. Open source! There's even a RetroArch core available for it.
SuperTuxKart: Really nice open source racing game, with bad graphics.
osu!: Open source anime rhythm game that I suck at. Make sure PulseAudio (or Pipewire) is managing ALSA, or sound may not work and you'll have a bad time like I did.