I don’t remember, but it was one of those yellow cartridges the size of your palm. I think they were knockoffs. Can’t say for sure.

It was a side-scrolling fighting game with tiny martial arts dudes. It could be played co-op. I think the bald character was overpowered, or I just felt like he was.
It was either a tournament style, attacking a rival dojo or both. Or something else.

I liked the cool art on the cartridge.