@Cobaltasaurus
Based on the Captain N cartoon. tl;dr: all video games exist as branches/locations in a massive digital world. A Nintendo playing high schooler gets dragged to the world to save the good guys from the evil forces of Mother Brain, King Hippo, Eggplant Wizard, Donkey Kong and Dracula.
The MUSH expanded on this to allow ANY game, be it NES, SNES, Genesis, PS2, PC, as well as more Gamemasters (dudes from Earth) representing the major hardware units/giants (Nintendo, X-Box, Playstation, Dreamcast, Atari), with a combat code based on a MUSH approximation of the Smash Bros. mechanic.
I played and staffed there, adn I had to agree with Jay; the massive sprawl made it extremely hard to get RP, and like Megaman MUSH, there tended to be a dearth of RP unless someone was 'Imma go invade an enemy Video Game'. It also suffered from the late era Megaman MUSH crowd (that was essentially too serious) and was the first game I ever had the issue of 'twenty minutes between poses' phenomenon pop up.