Hi there! I understand you’re not hearing any sound in the Tetris app or the Block Party app on your iPhone running iOS 17.5.1. Let’s dig into this together to get your game sound back.

First, can you tell me if you’ve already checked a couple of basics? For example:
- Is your phone’s mute switch turned off (the physical switch on the side of the iPhone)?
- Is the volume turned up while in the apps?
- Have you checked the sound settings inside each game app to make sure sound and music are enabled?

If you haven’t tried these yet, here’s a step-by-step you can follow:

1. Check the mute switch: Flip the switch on the side of your iPhone so the orange color isn’t visible, meaning silent mode is off.

2. Increase volume: Use the side volume buttons to raise the volume. While in the game, make sure the sound is audible.

3. Verify in-app sound settings:
- Open the Tetris app and Block Party app individually.
- Look for a settings or gear icon, usually on the main menu or pause screen.
- Make sure sound and music toggles are turned on (green bars or sliders to the right should be active).

4. Restart your iPhone: Sometimes a simple restart can resolve audio glitches.

5. Close and reopen the apps: Force close the Tetris and Block Party apps by swiping up from the bottom and pausing, then swiping the apps off the screen. Reopen them and test sound again.

If you have done all those and still no sound, here are some deeper checks:

- Do Not Disturb or Focus mode: Ensure these modes aren’t silencing app sounds. Check this in your Control Center or Settings > Focus.

- App updates: Make sure both Tetris and Block Party are updated to the latest versions via the App Store.

- Reinstall the apps: If sound still isn’t working, try uninstalling the apps and reinstalling them. Your game progress could be saved via your account, but it’s good to confirm before doing this.

If after all this the sound issue remains, it might be a specific bug or an iOS compatibility hiccup. In that case, I can help you report this to the developers or guide you further with advanced troubleshooting.

Could you please let me know what steps you have already tried or what you observe with these? That way, I can tailor the help for you exactly.

Looking forward to hearing back! Are you able to check those settings and updates now?