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When entering Snowy Mountain continue straight ahead across the gap and into the ice cave. Partway through you'll find a locked yellow eco vent, which requires Find the yellow vent switch to be completed to be unlocked.
After doing so use the yellow eco to destroy the strong box (called a crate in this mission) located a little forwards on the left side of the wall.
Alternatively, it is possible to break the strong box with the flut flut, though this can only be accomplished on the PS2 version.