The minigame starts, as 15 bob-ombs appear with their varying speeds. Drop them off the water.

(All of the players (or you alone or not) must work together to throw 150 Bob-ombs into the nearby water before they detonate right in front of the gate, damaging it. The players' score begins at 100%, though it decreases every time the gate is damaged. Bob-ombs run in various speeds to the gate. If a Bob-omb a player is carrying explodes, the score does not decrease, though the player is briefly stunned. Each Bob-omb explosion deals 7% damage to the gate. Thus, in order to get an S rank, the team must finish the minigame while allowing no more than two Bob-ombs to explode at the gate; keeping an A rank requires no more than seven Bob-ombs exploding. Letting 15 Bob-ombs explode at the gate causes the players to lose the minigame.)