The Torpedo is a booster available only when you’re playing a level. You can find its icon on the level goals bar next to the Hammer icon.

The Torpedo booster can create an explosion, equal to that of a Bomb, anywhere on the field without using a move.

Follow these steps if you want to use the booster:
1. Tap its icon.
2. Tap the part of the field that you want to clear.

You can purchase the Torpedo booster when you’re playing a level.