Hi! Thanks for reaching out about the brightness issue you're experiencing while playing Yahtzee on your iPhone. To make sure I fully understand, your screen keeps getting brighter and then dimming automatically, and when that happens, you aren’t able to select your numbers in the game—is that right?

If so, let's start by checking a few common settings that might be causing this behavior on your iOS device:

1. Disable Auto-Brightness:
- Open Settings.
- Go to Accessibility > Display & Text Size.
- Scroll down and toggle Auto-Brightness off.
This feature adjusts brightness based on ambient light, but sometimes it can cause fluctuations during gameplay.

2. Check for any screen or brightness-related settings in the Yahtzee app:
Some apps can control brightness temporarily. If Yahtzee has any in-app brightness setting (sometimes available in pause menus), try disabling that.

3. Restart your iPhone:
Press and hold the side button and either volume button, then slide to power off. After it turns off, press the side button again to turn it back on. This can clear up temporary glitches.

4. Close background apps:
Double press the Home button or swipe up and hold (depending on your model) and then swipe up to close all background apps. Sometimes other apps controlling brightness can conflict.

5. Update the Yahtzee app and iOS:
Ensure both are updated to the latest versions from the App Store and Settings > General > Software Update.

6. Check if True Tone or Night Shift is enabled:
- For True Tone: go to Settings > Display & Brightness, toggle True Tone off.
- For Night Shift: in the same menu, make sure Night Shift isn’t scheduled or enabled, as it can change screen colors and perceived brightness.

After trying these, please test the game again and let me know whether the brightness still fluctuates and if you can select numbers properly.

If the issue persists, I can guide you through some advanced troubleshooting steps! Does this sound good to start with?