Ultimate Brain Games is a cancelled collection of board games (as chess) that was in development by CrazyAce for the Jaguar. It seems that the project was canned in early development and only an alpha video was shared by viMasterJag on his Youtube Channel. As we can read from the video description:
I would have to call this an Alpha release. I don’t know exactly what the developer would classify it as, but that’s my take on the situation. This is Ultimate Brain Games, an unreleased product for the Atari Jaguar. It was never produced commercially, nor was it ever finished, I don’t think. We’re lucky to have its developer, CrazyAce, provide us with a playable version, though.
Thanks to Adam for the contribution!