A Ball 'n' Chain is a spiked ball on a chain swinging on a pivot. Bowser uses these as cautionary weapons against invaders, but Mario or Luigi can stand on the brick in the center to avoid being hit by the ball. Also, using a Spin Jump will allow Mario/Luigi to harmlessly bounce off the spiked ball. Many were found in the castles and fortresses in Super Mario World. They have a small, but decent reappearance in New Super Mario Bros., but only in the world 7-Castle. The blocks are still there, and one even has a Star Coin. As an added feature, they rotate wildly on the end of the chain as well as spinning on the block, however, this does not affect their attack. Their name in New Super Mario Bros. is Ball and Chain.