Hi! I understand that when you click on Dragon Mania Legends, it only shows a blue screen. Let's see if we can get this sorted out for you.

To start off, could you tell me if this started happening recently or if it has been like this for a while? Also, have you tried any fixes already, like restarting your device or checking for updates?

In the meantime, here are some steps that generally help with similar issues on Windows:

1. Restart your PC. Sometimes a simple reboot clears temporary glitches.
2. Make sure the game is updated to the latest version through the store where you downloaded it.
3. Check your system graphics settings for the game. You can try lowering them to "Low Quality" under Options > Settings > Graphics Settings.
4. Free up some disk space; insufficient memory can lead to loading problems.
5. Run the Windows Store Apps troubleshooter:
- Go to Settings > Update & Security > Troubleshoot.
- Find and run the "Windows Store Apps" troubleshooter.

If these don’t work, let me know what you've tried and any error messages you see. That way I can guide you to more specific solutions.

Are you able to try these steps now?