Spawning Rock Paper and Scissors (RPS) fall from the sky, whilst you must defend your RPS icons at the bottom of the screen. Select the corresponding RPS to swipe up and destroy the attackers. Double and treble hits award bonus points.
Look out for the power plays, enabled by destroying the enemy RPS that is on fire. This will give you a one time destroy everything shot, with bonus points for correct RPS hits. Power plays are the key to high scores.
Be careful, the action gets faster and more frequent as you progress through enemy waves of attack!
Good Luck!!!