Rovio Mobile has released Angry Birds Seasons in the Android Market and GetJar.com, after the initial launch. Angry Birds Seasons is a special winter and Halloween edition of the game. The winter edition comes with 25 levels, to represent 25 days till Christmas, and a bonus present level after all 25 levels have been completed. The idea is that you can only play one level a day, and get your present on Christmas day.
The Halloween edition comes with it’s own 45-levels and it’s own mini episode called “Trick Or Treat.” The levels are not locked like the Christmas version and you get a bonus pumpkin at the end of the levels.