ClayFighter Xtreme was the working title for ClayFighter 63 1/3, and the original name was kept for the planned PlayStation release, but it was cancelled because Interplay wasn't able to release it at the same time as the Nintendo 64 version, and didn't want it to be perceived as a port of the N64 version. After the N64 version, there was plans to finish the game anyway, but it never happened. If this did happen and the game was finished, it would have been the first (and only) ClayFighter game to be released on the PlayStation.