Burying the Hatchet
From the Super Mario Wiki
The objective is to have Wario's hand match up with Mario's, hence "burying the hatchet" to generous applause. If failed in WarioWare: Twisted!, the picture between Wario and Mario will turn black and white and split apart. In WarioWare Gold, if failed, Wario goes past Mario’s hand, looking back as he does so.