This game is simple. You need to touch on the flying monsters symbol in the bottom which have the similar lying monsters with the bottom lying monsters on the left line.
There are 3 difficult mode for you which have more type of fast lying monsters that you need to touch.
Bonus: If the left monster and the right lying monsters are the same, you can have double score when touch on the right lying monsters button. The lying monsters on the right column is only got by this method.
NOW FLYING MONSTERS ARE DROPPING, PLAY YOUR GAME.