Setback Shell

A Setback Shell (Knockback Shell in the British English version) is an item that takes appearance of a Green Shell, found exclusively on the Perilous Palace Path board from Mario Party: Island Tour. Players can potentially obtain the item if they land on one of the Item Spaces or if they win a minigame and select the item. When used, players can select an opponent to knock that opponent back two spaces.

In-game description

 * Sends an opponent back two spaces.