To start, press the left mouse button, then move the mouse over similar neighboring Expressions resulting the same value. (horizontally, vertically or diagonally); connect 2 or more Expressions. Release the mouse button to let the match happen. You have to connect Expressions in each tile at least once to finish a level. Try to make Expressions chains as long as possible to get best score. After a number of connections, you will get power-ups such as bombs and lightnings to help you complete the level.