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Cuby
Cuby is the fourth snow spirit Mario and Sonic meet during the Adventure Tour in Mario and Sonic at the Olympic Winter Games. It is the snow spirit of Cubyrinth. Mario and Sonic first find it guarded by Eggman Nega. After defeating him, they free Cuby and it joins the team after Pola return to Sparkleton. If the player has 4 yellow crystals, it can brake the ice walls in Cubyrinth.