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Wait, a city under a dome... That HAS to be a trope, right?
"Domed Hometown" lead me to Custom Robo, THAT'S IT! Rahu, thats what the thing was called!
https://tvtropes.org/pmwiki/pmwiki.php/VideoGame/CustomRobo
The TV Tropes hivemind helped me without typing a single word... I'm impressed. Thank you.
EDIT: And it's actually a Game Cube game too... interesting.
Edited by brucethemoose
Rented this from blockbuster ages ago... that should say alot.
Gameplay: It was a "virtual mech" game, where you controlled customized robots that would fight in a virtual battlefield against an AI. I also remember a part named "Umbra" or "Penumbra" or something.
Story: people would pit these virtual bots against each other in virtual arenas. Losing seemed to have some sort of psychological effect. Also, I remember a dramatic twist: the whole town was secretly inside a giant dome, and the rest of the world experienced some sort of apocalypse from one of these rogue robots. You eventually exit the dome to fight it, but I only got so far before returning it.
My Google-fu has failed me for years, as have other forums. Hopefully the TV Tropes hivemind can help.