Boosters give you special abilities to board passengers onto the busses. You can find them at the bottom of the screen while playing a level. To use a booster simply click on it to activate it.

↩️ Undo allows you to reverse the last move you've made.

⬜ Extra Tile provides you an extra tile, allowing you to send more passengers to clear the board. Extra Tiles break once the stickman on them boards the bus.

🖌️ Color Picker picks a passenger in the current bus color from anywhere on the board where the stickman appears and puts them on the bus.

➕ Extra Bus allows you to board passengers onto the rear bus. The rear bus only moves after the front bus leaves.