Change Kirby from a pink puffball into a white snowball. Packed with powder, Kirby can pack a pow by bowling over enemies.”
— Description • Nintendo Power
Rolling Snowball is a mix ability from Kirby 64: The Crystal Shards. Kirby will get this ability if he combines two Ice abilities together. With this, a large amount of snow will develop around Kirby, causing him to do a crushing-force roll, then plow and collect enemies. Not only are they trapped in the snowball, but they also get frozen and pop when the snowball is released.
Kirby becomes a giant rolling snowball, he will roll on until a wall is hit. Enemies will be absorbed into the snowball. After hitting a wall (or pressing B again) the snowball disappears, and any absorbed enemies are launched out as projectiles.
Kirby can roll along as a gigantic snowball, crushing anything in its path.”
— Description • Official Strategy guide
This ability is used almost exactly like Kirby's Return to Dream Land's Snow Bowl; the only differences are that Kirby can jump with Snow Bowl, the snowball is bigger, and Snow Bowl can roll quickly.