For the price of a cup of coffee ($5), you can own the Game of the Year edition on Steam or GOG, with no keys, no surveys, and no risk of infecting your computer. You’ll also unlock the genuine satisfaction of supporting the brilliant developers at PopCap who gave us Crazy Dave, the Zomboss, and one of the most beloved strategy games of all time.

Entering this key into the game client connected to PopCap's authorization servers to unlock the full game. Why Key Lists No Longer Work

Websites offering "Free Registration Keys" often contain malware, phishing scams, or unwanted software.