This is a nice free quick game that has a simple objective of Tapping this screen to get rid of enemies that increase in strength over 30 second period and with other easy game mechanics to follow such as a ring in the top center of the screen you can hit to destroy all enemies on the screen. Collecting coins is done automatically… coins level up strength, speed, max level of 999 each. You can play this game completely AD free! When I reinstalled this app I haven’t even seen a single AD offer The ADS used to give you coins to faster the progression. The replay value isn’t really there. I suggest increasing the Coins first, then strength, lastly Speed. You can choose your own way to progress through.