Rovio on Monday launched an Easter version of Angry Birds Seasons, available now for iOS, Android, Symbian, and Palm devices.

"Spring is upon us and the time is ripe for some chocolate eggs and Easter bunnies! So shed the winter gear and get in—Easter Eggs have never been this delicious!" Rovio said in its update notice. "If you think St. Patrick's Day was a blast, well, you ain't seen nothing yet! This episode will again prove that Angry Birds is the most generous update giver of them all!"

The Easter update includes 15 new springtime levels. Rovio also promised that it "will soon launch the biggest alternate reality game with Angry Birds ever—be prepared to seek for clues around the world to discover the secrets hidden in Angry Birds Seasons!"

Angry Birds Seasons is available for $0.99 on the App Store and free from Android app stores and the Ovi Store. Players who have already downloaded Angry Birds Seasons will get the Easter version as a free upgrade.