Do you know AppLike?
AppLike Suggest new games and rewards you with coins and gift-cards (Amazon, PayPal, Google Play…) for playing them!
Install the app here and you will receieve 4.444 coins with the registration.
Click on the link => goo.gl/Jt5jDb
Personal opinion:
Used this app right before bedtime and left the display on while charging. Earned 2 dollars over night LOL!