One strategy for Season’s Greedings level 1-15 is to fire the Yellow bird straight ahead, through the hat of the snowman. The bird should continue onward, detonating the two TNT in the middle and popping the far-right pigs. Then launch the Blue bird through the snow supporting the first set of ice blocks, causing them to fall on the pigs below. The score in the video is 65,310.
Note: Higher scores on this level are a result of the Santa Hat glitch. This glitch has since been fixed and thus is no longer possible. While we don’t have a video, the trigger was the Santa Hat atop the bottom-right pig, but resulted in a less extreme explosion. To see which levels have the glitch, we have tagged them.