Angry Birds: Seasons (iPod/iPhone)
Hogs and Kisses: Levels 16 to 18
Successfully complete all fifteen levels and then tap the "Like" button on the screen next to the fifteen levels.
Season's Greeding: Big Present level
Complete all levels with a "three star" rank.
Season's Greeding: Golden Egg level
Collect the Golden Egg on level 1-13.
Season's Greeding: Special trailer
Successfully complete all levels.