Hi! I understand you’re trying to get an extra flask in Water Sort Puzzle, but no ad pops up when you try, so you can’t proceed. Let’s look into this together.

First, just to clarify—are you able to watch any ads in the game at all, like for other hints or bonuses? Or does the ad fail specifically when you try to get an extra flask? Also, are you connected to a stable internet connection when this happens?

Here are some steps you can try to fix this on your iPhone with iOS 18.7:

1. Check Your Internet Connection: The ads usually need an active internet connection to load. Switch between Wi-Fi and cellular data to see if either works.

2. Restart the Game: Sometimes restarting the app can reset the ad loading. Completely close the Water Sort Puzzle app and reopen it.

3. Update the App: Make sure you have the latest version of Water Sort Puzzle installed from the App Store. Developers often fix ad-related bugs in updates.

4. Disable Content Blockers: If you have any ad-blocking or content filtering apps enabled on your iPhone, temporarily disable them, as they might prevent the ad from showing.

5. Check Device Settings for Ads: Go to Settings > Privacy > Tracking, and ensure "Allow Apps to Request to Track" is enabled. Some ads need this permission.

6. Reinstall the App: If none of the above works, try deleting and reinstalling the game. Be mindful if you have any saved progress not linked to an account.

If after these steps the ads still don’t appear for the extra flask, it could be a temporary issue with the game’s ad servers or a bug specific to your game version. In that case, contacting the game’s support directly might be needed.

Would you like me to guide you through any of these steps? Also, please let me know if you have tried any already.