It just said "Permission Denied" on the terminal menu and still didn't work1. Right click the Togheter again app and click "show package content"
2. Go to "Contents" and then "MacOS". You should see a blank looking file named "Togheter Again (mac)" here.
3. Now go to the "Terminal" app
4. Type in: "chmod +x [drag the blank looking Togheter again file here]"
5. Press Enter
6. The app is now modified into a version that your Mac can play. The icon of the blank looking file in the MacOS folder now shows an icon with "exec" on it.
7. Play the game
Did you try it?