A physics platformer where you are a snowball, which means you roll rather than walk and momentum is a thing you have to spend carefully. Twenty-five levels take you through gift collecting and end each time at a finish-line present. The early ones are gentle enough to be mistaken for a children's game; the later ones put the last gift somewhere that needs a bounce set up two jumps in advance. SnowBall Platformer is the most substantial of the seasonal games in this batch.