Learn the ordinary station corridor, find the real stairs and track down every change. The full anomaly list stays hidden until you want it.
PS5
Trophies
4
Difficulty
2/10
Completion time
About 1–2 hours
Playthroughs
One save, with repeat trips through the passage
Before you play
Known trophy issues
None known
Missable trophies
None known
Chapter select
Unavailable
Postgame cleanup
Available
Four gold trophies on PS5. Continue on the same save after escaping to find the remaining anomalies.
Your route to completion
Start in Roadmap with Learn one ordinary corridor. That section explains what the unchanged passage looks like and how to make a correct decision. Find the remaining anomalies covers the collection hunt after your first escape. These are stages of our route, not separate game levels. Read each section's notes before following its linked trophy solutions. The Trophies view gives you direct access to individual solutions.
You can make the first escape without reading the full anomaly list. If a detail keeps catching you out, open the spoiler panel in Underground Passage Local, where the changes are grouped by landmark. The rest of the route explains the rules and cleanup without listing every surprise.
First, find the stairs. Learn the corridor on the opening walk, then use the yellow sign to track your decisions. Turn back whenever something changes. Walk through when everything matches. Eight correct calls bring the exit within reach. Follow The Exit 8 if you're unsure which staircase to take.
Then finish your collection. Go back in on the same save and check the notice showing how many anomalies remain. Underground Passage Expert and Underground Passage Master unlock at ten and twenty distinct finds. Keep going for Underground Passage Local, which includes the five variations added after launch. A bad call costs you the current streak, so there's no reason to start over for a missed detail.
Learn one ordinary corridor
Walk through the opening passages until the yellow numbered sign reads 0. Use those first passes to learn the ordinary scene. The man with the briefcase walks past without acknowledging you. On the poster wall, the pictures stay still. Opposite them are three closed doors. Look up at the lights and both sides of the hanging sign, then down at the straight yellow paving strip. You'll see the same features from the same approach each time you enter a fresh passage.
At the start of a lap, look down the full length of the hall before moving closer. If you see something different, physically turn around and walk back around the corner you came from. If everything looks ordinary, keep walking around the far corner. You never need to interact with the thing you spotted. The number at the next junction tells you how you did. A correct call advances the exit number. A mistake returns it to 0.
I'd play until the first escape without opening the list below. The first time a door moves or somebody looks back is part of the fun. If you're stuck at the last sign, see The Exit 8.
The Exit 8
gold
Go out from Exit 8.
Build a streak of correct decisions until the yellow sign reaches 8. A normal hallway calls for walking through. On a changed hallway, turn around and leave the way you entered. Walk far enough to reach the next sign each time. Simply looking back has no effect.
At 8, keep applying the same rule if you see another furnished corridor with a change. The genuine way out leads through a shorter passage to the stairs. Take those stairs to finish. An early staircase while your number is below 8 is itself a reason to turn back.
After escaping, return to the passage on the same save. Check the notice near the numbered exit sign to see how many anomalies remain undiscovered. That number tracks your collection. The yellow exit number tracks your current streak. Losing the streak leaves your discoveries intact.
On each lap I’d scan in the same order. First check for an immediate threat ahead. Walk beside the posters long enough to notice gradual movement. Count the doors, check their handles and glance back after the commuter passes. At the far end, look up and behind you before you commit. Once you identify a change, turn back and walk to the next numbered sign to register it.
The spoiler list in Underground Passage Local groups all 36 changes by where to look. You can use it for just the part of the corridor you tend to overlook.
Spoiler: reveal trophy
Underground Passage Expert
gold · collectible
Find 10 anomalies.
Correctly leave ten different changed passages. As soon as you spot a difference, turn around and walk back around the entrance corner. The next exit number confirms the decision. Inspect the commuter first on every pass so a fast-moving version can't catch you while you're reading posters. Your discoveries accumulate across resets and escapes.
Find twenty distinct changes using the same save. If obvious changes have become scarce, slow down on the poster side and turn to watch the commuter after he passes. Look at the back of the overhead sign too. These checks catch changes you can walk straight past even when you know the layout. After your first escape, the wall notice tells you how many of the full set remain. See Underground Passage Local for a visual sweep of the corridor.
Find all 36 different anomalies on the updated PS5 game. Leave each changed hallway through the corner you entered. After your first escape, return on the same save and use the remaining-anomalies notice to judge progress. You can keep hunting even if a wrong decision takes the exit number back to 0.
Spoiler: All 36 changes by landmarkShow
Check the people first (9). The commuter can grin, watch you as he passes, run at you, appear unusually tall, have a distorted flickering face, or follow when you look away. Three other encounters change who is in the hall. A pair of suited men stand together, a figure blends into the tiled wall ahead, or a camouflaged figure peeks around the far corner and disappears. If anyone rushes you, retreat immediately.
Read the posters in passing (7). Look for a row of identical adverts, posters slowly swelling, black scribbled eyes on the second poster, an eerie face replacing the MOVEFES picture, or an extra shaking animal poster near the far end. The security-camera advert has two separate changes. In one, its illustrated eyes move. In the other, the whole poster slides along the wall.
Check the service wall (7). The first door can be missing or rattle as though someone is pounding on it. The middle door can be ajar with someone peering out. The last door can swing open, or its handle can sit in the middle. Also check the vent for an inky leak and the walls for a mass of no-smoking signs. Leave an open door alone and retrace your steps.
Look up, then look back (9). The camera above its warning poster can show a red light. Ceiling fixtures can flicker, hang crooked, go dark ahead or switch off behind you. The entire corridor can turn yellow. Check the hanging sign for upside-down lettering and, once you've passed it, for a repeated warning on the back. Look at the ceiling beyond it for a faint face-shaped stain.
Check the floor and exit (4). The yellow paving can develop face shapes or spread into an irregular cluster. Red water can surge toward you from the far end. Turn back immediately and hold while moving to run around the entrance corner before the flood reaches you. Finally, stairs can appear before you've earned the exit. Head back if those stairs appear before the sign reaches 8.
