Dark Hollow is a mysterious and dreamy realm, set late at night under a starry, deep-colored sky with clouds on the horizon illuminated softly by a rising moon. It has some stone structures similar in appearance to Stone Hill. The realm is characterized by hopping, croaking frogs, grassy stone platforms, steps, and lanterns emitting a warm glow.
There is a checkered-floor tunnel hidden underground, which is patrolled by Gnorc Sentries. It leads to a round, stone room with platforms and a pool of murky, indigo water illuminated from beneath. The key to the Locked Chest from the central platform is in this room.