In late 2023, Rovio released Bad Piggies 2 . This is a free-to-play mobile game with in-app purchases. It does not utilize a traditional "Activation Key" system in the same way the original PC release did. The PC version of the original game is no longer officially sold on major platforms like Steam.
For a period before the total shutdown, the servers were configured to accept any text as a valid activation key, effectively making the PC version free for anyone with the installer.