This Mysterious Room segment only appears during the Winterfest event.
It rewards a cache of 36 Grinchlin Treasure Boxes that contain crowns, heat, and 
Frozen Winterfest Wishlist tokens.
The player must choose between:
Left Path
Exploration entities:
If path seems clear (visual):
Monsters:
Wave 1:
Polar Polyp x3
Frozen Shambler x4 (last through waves unless defeated, the room can be "completed" if they are left alone)Wave 2:
Wave 3:
Exploration entities:
If there are 4 stand-alone Mush Blocks (visual):
Monsters:
Wave 1:
Wave 2:
Wave 3:
Exploration entities:
or
Right Path
Exploration entities:
If there are two rows of explosive blocks (visual):
Monsters:
Wave 1:
Slush Puppy x4 Ice Cube x4 Snow Drop x8Wave 2:
Silversap x4 Slush Puppy x4
Grinchlin Scorcher x2 Grinchlin Thwacker x4Wave 3:
Silversap x4 Icy Mortafire x2 Frozen Deadnaught x3Exploration entities:
If there are two arcs of mush blocks (visual):
Monsters:
Wave 1:
Slush Puppy x2 (last through waves unless defeated) Grave Scarab x10 Polar Polyp x4Wave 2:
Slush Puppy x2 (4 total, if previous two were not defeated) Grinchlin Scorcher x2 Grinchlin Thwacker x3Wave 3:
Grinchlin Stalker x2 (3?) Freezing Bombie x4 Frozen Shambler x4Exploration entities:
