Hi there! I’m sorry to hear that Angry Birds 2 shuts off before opening on your Mac. To help you best, can you tell me if you’ve noticed this started happening recently? Also, have you tried any fixes so far, like restarting your Mac or reinstalling the game? That info will help me guide you properly.

In the meantime, here’s a simple step-by-step you can try, tailored for your Mac (OS X 10.15.7):

1. Restart your Mac: Sometimes a fresh start clears temporary glitches.
2. Check for game updates: Make sure Angry Birds 2 is updated to the latest version on the App Store.
3. Clear game cache: Unfortunately, macOS apps don't always have a clear cache option, but quitting the app fully and restarting can help.
4. Reinstall the game: Delete Angry Birds 2 from your Applications folder, then download and install it again from the App Store.
5. Check your internet connection: Angry Birds 2 sometimes needs a stable connection on startup.
6. Sign out and back into Game Center: On Mac, go to System Preferences > Apple ID > iCloud > Game Center. Try signing out, then sign back in.

If the problem remains after these, it might be related to your Game Center account or a corrupted install. Some players have reported that signing out of Game Center on their device and reinstalling the game resolved crashing on startup1.

Let me know which steps you’ve tried or if you want me to guide you through any specifically!

Game shuts off before it even opens.

Thanks for sharing that, and I see the game shuts off before even opening on your Mac running OS X 10.15.7. Since the problem persists, let's try a targeted approach that has helped some users facing similar crashes on startup.

Here’s what I recommend:

1. Uninstall Angry Birds 2 completely from your Mac. To do this, drag the app from the Applications folder to the Trash and empty the Trash.

2. Sign out of Game Center:
- Open System Preferences on your Mac.
- Click on Apple ID, then select iCloud in the sidebar.
- Click “Sign Out” at the bottom and confirm.
Signing out of Game Center (which is part of your Apple ID/iCloud) can sometimes clear corrupted game data linked to your account.

3. Restart your Mac to clear any cached temporary files.

4. Reinstall Angry Birds 2 from the Mac App Store.

5. Sign back into Game Center via System Preferences > Apple ID > iCloud.

This method of uninstalling the game, signing out of Game Center, then reinstalling and signing back in has been reported to fix startup crashes for Angry Birds 21.

If you want, I can guide you through these steps one by one. Let me know how it goes or if you need help! Are you satisfied with this solution or would you like to explore more options?