Snowballs that are thrown from the enemy base to the Cat Base at really high speed. They are the most annoying enemy in the event: they remain on the ground after they hit a Cat Unit and need an attack from the Cats to actually clear them out, which is a disadvantage for players that bring many Cats that attack one enemy at a time. Their damage increase as the player progress through the event. The third stage in the event has snowballs that spawn at ridiculous rates. They are very similar to Brollow, they attack quickly and hard but then will remain stationary for a while.
Good defense is necessary to endure the snowballs, particularly in the form of lots of meatshields. If one has cats that can perform Wave Attacks (Manic Macho Legs, Slime Cat etc.) use them, as they can easily clear the path of many snowballs. Snowballs can be cleared when they are flying to the Cats by any kind of attack. However, their quick speed makes it so that most cats cannot hit them in time. Metal Cat can be useful against them in small numbers, but the massive amounts of snowballs in later stages will easily break him down. Hurricat is a noteworthy exception, as it completely obliterates snowballs; it outranges them, attacks extremely quickly, its mediocre damage-per-hit isn't an issue, and has Area Attack to clear out large amounts of snowballs.