The original. Navigate by memory through the fog and find the exit.
Your torch burns down as you walk, and hieroglyph tablets light the way forever.
You carry almost no light — bioluminescent blooms permanently light a patch once touched.
A pocket-sized 25×25 ridge, visible all at once — but the ground behind you catches fire.
Nothing is hidden — but the ice shifts between Stable and Shifting every 15 moves.
Fully visible, but passage is barred by clockwork gates that only open on their own beat.