Bros. Ball

Bros. Ball is a move learned by Mario and Luigi in Mario & Luigi: Partners in Time. In this move they both turn into a ball and can now move faster. Additionally, the Bros. Ball lets Mario and Luigi go under walls in the game. Later on, Mario and Luigi learn the ability to flatten Baby Mario and Baby Luigi. This move is called Baby Cakes.

This move may be a nod to Mario Pinball Land. Also, the "Rolling Combo" seen in Sonic the Hedgehog 4: Episode II bears a striking resemblance to the Bros. Ball, but it is functionally different.