The casual point-and-click adventure Age of Enigma is coming to the Mac App Store next week, and three lucky Mac users can win promo codes courtesy of the developer. Keep reading to see how you can win your very own free copy of the game.

If you have a Mac, all you need to do is send an email to erin(@)gamezebo(.)com with the title “Age of Enigma Giveaway” and tell us what your favorite game of 2011 is. The first three people to do that will receive a promo code to download the game from App Store when it launches on Dec. 7. The contest is open until Dec. 7, 2011.

Age of Enigma: Mac App Store Special Edition will sell for $7.99, and includes an additional puzzle that wasn’t available in the original PC release.