Too much heating of the device can reduce the brightness of the screen. If you encounter this problem, below are some instructions that can help you solve it.

1. Decrease the Frame Rate of the game from the in-game Graphic settings
2. Go to [Settings]->[Graphics & Audio], turn up the [Brightness].

3. Play the game after your device cools down
4. Avoid playing the game while charging your phone
5. Cautiously turn off the auto brightness of phone, because this may affect your phone batter life.
[IOS] -> Settings -> General -> Accessibility -> Display Accommodations -> Auto-Brightness.
[Android] -> Settings -> Display -> Disable the adaptive brightness.

* Please be noticed that the brighter the brightness, the faster the battery will drain.
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