Hi there! I can help you with the "Unable to connect to server" issue in Puzzles & Survival. Let's go through some steps to troubleshoot this together.

1. Check Internet Connection: Ensure that your device is properly connected to the internet. You can try switching between Wi-Fi and mobile data to see if that resolves the issue.

2. Clear App Cache: Sometimes, cached data can cause connectivity problems. To clear the cache:
- Go to Settings on your device.
- Tap on Apps or Applications.
- Find and select Puzzles & Survival.
- Tap on Storage, then click Clear Cache.

3. Restart Your Device: A simple restart can sometimes fix temporary glitches that may be affecting your connection.

4. Reset Your Router: If you're using Wi-Fi, try resetting your router by unplugging it for about 10 seconds, then plugging it back in.

5. Reinstall the App: If the steps above don't work, you may want to try uninstalling and then reinstalling the game. This can help if there are corrupted files affecting your connection.

If you've already tried these steps or if you're still having trouble after this, please let me know. I can look into further options or escalate the issue. Are you satisfied with the solution I provided?