Screwballs Superleague is a cancelled brawler / action game that was in development in 1990 by Rare. The game had two modes of play, battle mode and cooperative play: players would each start a level in their own “spin engine”, which would spin-up the character from their normal state into a spinning top. Players could exit the “spin engine” at any time, but it took time to spin the character up to full speed: the faster they were spinning, the more energy they had to throw either another player out of the battle arena (in battle mode) or an enemy monster (in coop mode).
As they player bashed into things, and over time, their spin energy would decrease making them more vulnerable to attack, so they would need to periodically head back into their own spin engine to spin-up to full power again.
Sadly Screwballs Superleague was canceled when the lead programmer left Rare. The game was pretty fun, but was months away from being completed and at the time they did not have a publisher for it yet.
Thanks a lot to Simon for his help in preserving some info on this lost project!