The trails they leave behind have a similar appearance to Dark Matter in the first game, which combined with their names implies they're made from Dark Matter.
They can't be defeated or harmed, and the only thing Mario can do to them is stomp on them to make them eat in the opposite direction. Mattermouths, new enemies to the series, appear as large and disembodied Dry Bones heads surrounded by dark purple aura that somehow consume matter itself, eating through parts of levels and leave gaping holes behind them.It also has to be fought under the conditions of a Daredevil Comet. Compared to its big brother, it's far less imposing in size and can't crush Mario instantly, but it still dwarfs the Mario bros., has red eyes and emits smoke from its "mask" on top of being far more mobile than Megaleg, being able to leap off-screen. Digga-Leg is essentially a smaller version of the first game's Megaleg boss, sharing several of the same menacing qualities such as its gas mask-like face.Bear in mind it also isn't so much as hinted how or why these things exist, and the fact that there's an entire comet type that causes them to appear seems to imply they have no affiliation with Bowser and are simply created by some kind of mysterious force that naturally exists within the galaxies.The game also features Clone Comets, which force Mario to go through an entire level while being pursued by them, and which often feature a menacing theme with a startling intro that combines the underground theme with the original overworld theme. They'll likely only seem like a minor nuisance the first time you come across them, but in more restrictive spaces and when they spawn in large numbers, it's easy for just one brush with them to lead into either being dogpiled or knocked to your doom. This game introduces the Cosmic Clones, shadowy dopplegangers of Mario with glowing yellow eyes who mimic his every movement and cause damage on contact, suddenly appearing from nowhere with a high-pitched cackle and vanishing with a pained scream when the conditions are met to defeat them (usually doing something to make the level's Star appear).The sounds they produce don't help matters at all. The black holes, much like in the first game, can be found in many places just waiting to suck Mario in if he falls off within range.Damaging Sorbetti three times will cause it to explode and release the Power Star. In order to damage Sorbetti, the player has to spin at its large, red nose, and Sorbetti will begin rolling faster each time it is hit.
Sorbetti will begin rolling around the planet toward the player, though his course will be effected if it hits a snow stalagmite. The Launch Star will send the player to an inanimate Sorbetti and using a Sling Star to reach its "body" planet will cause Sorbetti to wake up. Taking a path to the right of the player's starting position, past the Warp Pipe, will lead to a slope ending at a Checkpoint Flag and a Launch Star. This planet is covered in an icy fog, limiting the player's vision.
Once all five Star Chips are collected, a Launch Star will appear to send the player to the White Out Planet. On the Snow Doll Koopa Planet, the player has to use the Rock Mushroom power-up to break ice sculptures, trees, and crystals to find five Star Chips, one of which is located back at the top of the hill where the player started.
Using a Rock Mushroom power-up, the player has to move to the underside of the planet and destroy a Goomba ice sculpture by ramming into it, revealing a Launch Star to the next planet. The player starts next to a cottage on a disk-shaped planet.