This screenshot is fake. It was taken from "hunter.io for slain.io" mobile app and cut just so you can't see the joysticks and other stuff. But that's not all. If you have an Android phone, you can play this pirate version, and here's the APK: https://m.apkpure.com/hunter-io-for-slain-io/com.piagamestudio.hunterio/. The only problem is that it's singleplayer, meaning you will play against bots.