A lot of devices (especially high-performance ones) do heat up when running resource-intensive games or apps. That's absolutely normal. However, if the heat bothers you, there are a number of things you can do:
1. Close other applications before entering the game.
2. Make sure your device's battery is at least 50% charged before you start playing.
3. Make sure your device software is updated to the latest version.

If the heat affects device performance, we recommend contacting the manufacturer for further instructions.