Blizzard Island is a dungeon from Pokémon Mystery Dungeon: Explorers of Time & Explorers of Darkness and Pokémon Mystery Dungeon: Explorers of Sky, and has 20 floors. You can unlock Blizzard Island after graduating from Wigglytuff Guild, completing two optional jobs and then speaking to Mr. Mime. When you complete Blizzard Island you can enter Crevice Cave.