Boosters are items in Mario Party: Island Tour. They only appear in Rocket Road and can multiply the Dice Block's value if used. If a player uses four Boosters and gets a 25, it results in an automatic win, due to the board's length.
Boosters are used to multiply the values on the Dice Block. Despite this, 0 will always remain on the Dice Block. A player should be careful, because even if the Dice Block lands on 0, the Boosters will be used up anyway. However, even if the player rolls a zero, they will still receive a Booster if they're on a Booster Space.