Combining power-ups creates a bigger explosion and helps you clear more tiles.
Rocket + Rocket clears the row and the column of that tile.
Rocket + BOMB clears three rows and three columns of that tile.
BOMB + BOMB clears the items within a nine-tile radius.
Propeller + Propeller creates three Propellers that clear three random game elements. When taking off, Propellers also clear neighboring tiles.
Propeller + Rocket or BOMB makes the Propeller carry the TNT or Rocket along with it to a random tile. When taking off, the Propeller combination also clears neighboring tiles.
Energy Core + Rocket or BOMB or Propeller makes the Energy Core turn the most common colored items on the board into a Rocket, BOMB, or Propeller.
Energy Core + Energy Core clears all the items on the board, and it also clears one layer from any game element.