Okay, so ive been trying to get this game to work for a while now, have never been able to get the multiplayer working and the singleplayer games are buggy depending on the rom or settings. Anyways, im using an NTSC WBFS rom of Metroid Prime Trilogy on USBLoaderGX, all i did to get it to work...
I didn't know they made an MSU cart for the Genesis.... I knew about the SNES one and the library for that is rather large but the Genesis one has very few games