A free app for Android, by Razer Inc..

Razer Cortex GamesPlay Earn is the official app of the Razer company. The app offers a way to earn points from games you play and redeem them for rewards like eShop vouchers, game cards, and even real prizes like the ones you see on the game’s leaderboards. The more points you earn, the more rewards you’ll receive.

The best part of this app is that it’s completely free to download and use. There are in-app purchases and other kinds of monetization methods. However, the way to get your rewards for free is to play and earn points from the games you already play.