Levels in the Ice Caves may contain platforms made of Thin Ice, usually suspended over traps such as Spikes or the Abyss.
These will gradually melt away while you stand on them, dropping you onto whatever lies below. The ice itself does no damage, but fall damage or any hazards below could kill the Spelunker.
The Giant Yeti's roar damages this kind of ice as well as dropping ice blocks.
Enemies and items may stand on the ice without causing it to melt.
It is used as part of the area's Golden Idol trap.