: The key must consist of four groups of four characters separated by dashes (e.g., XXXX-XXXX-XXXX-XXXX ).

As of , the activation servers for most legacy Angry Birds PC games, including Rio, were permanently shut down. This means that even with a genuine key, the game may fail to verify it because it cannot reach the authentication server.

For Angry Birds Rio specifically, the game usually requires any code that follows the XXXX-XXXX-XXXX-XXXX