Hourglass Twins

Outer Wilds guide · Returning to explore the caves after sand shift

As the sand stream pours from the Ash Twin onto the Ember Twin, the cave networks on Ember Twin fill up while the ruins on Ash Twin gradually uncover. Exploring the caves beneath the surface of Ember Twin requires acting early in the time loop before rising sand completely blocks access passages and crushes the player. Later in the loop, attention shifts to the exposed towers on Ash Twin to access locations like the Ash Twin Project.

Secrets

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Anglerfish fossil cave on Ember Twin | Fire a Little Scout down the chute inside the cave with the children's drawing to illuminate the path, then follow the illuminated path carefully to avoid sand and reach the skeleton.Lakebed Cave path | Track the movement of the quantum rock inside the cave and step into darkness to manipulate the rock's position until the passage underneath opens.Ash Twin Project interior | Wait inside the broken Ash Twin warp tower under the ceiling until the sand funnel overhead aligns directly above, then step onto the warp pad while remaining grounded to warp inside.

Enemies

Sand column

Moving between the planets via the sand column will trap and pull you rapidly toward the other planet, potentially crushing you against terrain.

Ghost Matter

Invisible lethal hazard found in several cave passages on Ember Twin; detect its footprint using the camera on your Little Scout.

Cacti

Hazardous spiky plants lining several tight passages in the Ember Twin caves; touching them damages your suit and costs health.

Shops and people

Chert: Campfire with dialogue updates, marshmallows, and music broadcast

Tips

Enter the Sunless City early in the loop because the rising sand will submerge lower districts, doors, and walkways within minutes.
You can use your Little Scout to check if a sand-filled hallway is completely impassable or still has enough clearance to crawl through.
Look at the ceiling of Ember Twin caves for quantum fluctuations if you are navigating Lakebed Cave or looking for the Quantum Moon locator.

Not listed for this area: items.

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