A Pre booster is a tool that helps you pass challenging levels. You can activate the pre booster on the pre booster selection screen that appears before starting the level. After activating the Pre Boosters, you can directly start the level and use them.
1. Extra Tile: Your holder gains an extra space.
2. Rocket: Clears your holder and matches those tiles.
3. Butterfly: Butterflies reduce the number of unique tiles in the level, so you can consider the difficulty of the level.