From the Super Mario Wiki
Shivering Mountains is an icy mountain range and the fifth level that Wario must go through Wario World. It is also the first course of Thrillsville, accessed by entering an igloo in the area. The course contains ice-themed enemies, deep snowdrifts that can trap Wario, exposing him to enemy's attacks, along with other obstacles. Several large Christmas trees highlight the atmosphere, plus a plenty of igloos. Here, the boss is Winter Windster.
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