In October 2010, Rovio released a special Halloween edition of the game. Angry Birds Halloween, exclusive to Apple iOS at the time and a separate application from the main game, included new levels with Halloween-themed music and graphics. In December 2010, Rovio released Angry Birds Seasons to iOS, Android and Symbian^3 devices. Seasons introduced 25 Christmas-themed levels, one for each day leading to the holiday, similar to an Advent calendar.
All versions include the previously-exclusive Halloween levels and are offered as separate, stand-alone paid applications, with the exception of the free, ad-supported Android version; Angry Birds Halloween users on iOS received the Seasons levels as a free upgrade.
The Halloween version was given the episode title "Trick or Treat", while the Christmas episode was entitled "Season's Greedings". In February 2011, Rovio released a new Valentine's Day update to Angry Birds Seasons, entitled "Hogs and Kisses", complete with new themed levels and graphics, as well as the option to send Angry Birds-themed Valentine's Day messages through Facebook. In March 2011, Rovio released a new St. Patrick's Day update, entitled "Go Green, Get Lucky", followed by an Easter update, entitled "Easter Eggs", in April 2011 and a summer update, "Summer Pignic", in June 2011.
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