Hi there! I'm sorry to hear that Mahjong 3! isn't opening on your Kindle device. Let’s work together to troubleshoot this.

First, can you tell me if there are any error messages when you try to open the game? Also, have you recently changed anything on your device, like updates or new apps?

In the meantime, here are some initial steps you can take to try to resolve the issue:

1. Restart Your Device: Sometimes a simple restart can fix app-related issues. Press and hold the power button on your Kindle until you see the option to restart, then select it.

2. Check for Updates: Ensure that both your device's system and the Mahjong 3! app are up to date. To check for app updates, go to the Google Play Store, tap on 'My apps & games', and see if there's an update available for Mahjong 3!.

3. Clearing Cache: Go to your Kindle's settings, then to "Apps" or "Application Manager." Locate Mahjong 3! in the list, click on it, and select "Clear Cache." This can help remove any temporary files that might be causing issues.

If the game still does not open after trying those steps, let me know, and we can dive into deeper troubleshooting options.