Playing as Chibi-Robo, the player must clean all of the dirt on Desk while Wario tries to attack them with a time limit of 0:24. There are four spots of dirt and Chibi-Robo can clean them using Toothbrush. Chibi-Robo and Wario each have 1 stock, but the event will continue even if Wario is KO'd.
The ranking the player receives is based on how much damage is dealt to Wario during the event, with damage dealt being awarded in points. The S ranking can only be received if Wario is KO'd. The specific conditions for this are listed below.
The dirt uses the same sprites as the ruptured ground when a character is buried.
In version 1.0.0 of Beta, clearing this event match would unlock the stage Desk, but this was changed in version 1.0.1 when Desk became a starter stage.