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Hi Up230,

Thank you for using the Apple Support Communities. You’ve posted a question in the English Community. If you are able to repost your question in English, you may reach a larger audience and have a better chance of receiving a reply.

Thanks!

Hey there Up230!

We understand that the brightness on your display goes down whenever you play a game. We'd be happy to provide information to help you address this.

Try turning off auto-brightness to make sure this is not causing the behavior you're experiencing:

Adjust the brightness and color temperature on your iPhone, iPad, or iPod touch

"About brightness levels

iOS devices use an ambient light sensor to adjust brightness levels based on the light conditions around you. The sensor lowers brightness in dark locations and raises brightness in light locations. The auto-brightness feature is on by default.

When auto-brightness is on, you'll notice that the brightness slider on your device moves according to changing light conditions.

You can turn auto-brightness on or off in Settings > Accessibility > Display & Text Size. To reset the auto-brightness settings, turn off auto-brightness and then turn it back on."

Have a great day!