SIGNALIS Walkthrough: Complete Puzzle Guide, Nowhere, Rotfront, Endings & Achievements

How this guide is built: SIGNALIS is much better when you solve its atmosphere first and its passwords second. This walkthrough therefore starts with spoiler-light survival habits and an area route, then moves into direct puzzle answers, Nowhere door patterns, Rotfront tarot and moon-phase solutions, ending requirements, Artifact/Lily steps, and achievement cleanup. The supplied sources were fetched before writing: Gameactuality, Showgamer, PSNProfiles through a Wayback snapshot, Neoseeker’s Nowhere page through a Wayback snapshot, the Fandom guide index through available reader/snapshot output, and the Steam community guides were checked directly. A few pages were Cloudflare-blocked live, so blocked live fetches were not treated as source text.

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What is SIGNALIS?#

SIGNALIS is a retro survival-horror game from rose-engine, released on Steam on October 27, 2022. You play as Elster, a Replika technician searching for a lost partner through the wreck of the Penrose-512, the S-23 Sierpinski facility, the mines below Leng, a place called Nowhere, and the Rotfront colony. It borrows the practical shape of classic survival horror: fixed-perspective rooms, a limited inventory, save rooms, body-burning, locked routes, optional fights, and puzzles that expect you to read notes instead of brute forcing every keypad.

The important difference is that SIGNALIS treats memory as part of level design. A room can return wrong. A familiar code can matter again. The radio is not just a gadget; it is a puzzle language. If you want the smoothest first playthrough, use the route sections and keep the answer table for when a puzzle stops being fun.

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Before you spoil yourself: survival rules that matter#

These habits solve more of SIGNALIS than any single password. They also keep the guide from turning into a dead list of rooms.

• Carry one weapon, one ammo stack, one healing stack, one utility module, and two free slots. The six-slot inventory is the real enemy. Key items should live in storage until you know the next door that needs them.
• Do not kill everything. Kill in narrow return routes, save rooms exits, and puzzle loops you must cross repeatedly. Dodge in one-time rooms.
• Burn only high-traffic bodies. Thermite is best spent on corridors you will revisit, not on an enemy guarding a room you will never enter again.
• The shrinking aim box is damage. Holding aim for a moment usually makes shots stronger. Panic firing wastes more ammo than missing once.
• Read files before touching keypads. Several puzzles are generated from radio signals, notes, or symbols. A copied number is sometimes wrong because your playthrough expects a different radio-derived code.
• Use the radio whenever a room hums, flashes, or shows a symbol. Tune slowly. When a code appears in the receiver transcription, write it down before leaving the screen.
• Save in rotating slots. Keep one save at the start of each major area and another for current progress. The secret ending and Survival achievement both punish careless overwrite habits.
• After credits, do not assume the game is over. If the menu changes from Continue to Begin, choose Begin and continue the cycle.

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Complete area route#

This section keeps the game moving without explaining every footstep. If you only need one locked door or puzzle, jump to the answer tables below.

Prologue: Penrose-512

1. Leave cryo, climb to the central ladder room, and collect the Adhesive Tape from the Mess Hall terminal area.
2. Inspect the photograph from the ship. The back gives the keypad pattern for Cryogenics. If you want the direct input, use 1, 3, 5, 8, 9.
3. Take the broken Airlock Key, combine it with Adhesive Tape, then use it in the Airlock Chamber.
4. In the first-person snow sequence, keep moving through the arch and crawlspace until you pick up The King in Yellow. This ends the prologue and unlocks SYNCHRONIZITÄT.

Sierpinski B1-B2: reception, classroom, butterfly box

Start by taking the Receptionist Key from the counter and opening the right door. Your first practical loop is simple: save room, Protektor Key, Observation Room, pistol, Aperture Card, microfilm viewer, Classroom 4B safe.

1. Use the Protektor Key in the Observation Room. Take the Pistol and Aperture Card.
2. Use the Aperture Card at the microfilm viewer to learn the classroom safe code, then open the Classroom 4B safe with 204512 and take the Classroom Key/Card.
3. Open the classroom/aula route and drop through the hole.
4. Call the elevator, take the Service Hatch Key, then solve the service hatch lock by aligning all pin lines to the center. This lock is not a fixed password.
5. In the new wing, take the East Wing Key, then loop through Mensa/Rationing to get Mensa Key, West Wing Key, and both Broken Key pieces.
6. Combine the Broken Key pieces into the Butterfly Key. Read the Interrogation Room note because it records your Protektor safe frequencies.
7. Open the Butterfly Box and take the Plate of Eternity. In the memory, pick up the REM-64 Radio Module and tune to 160.000 to open the radio station door.

Sierpinski B2-B3: radio safes, five elemental keys, Mynah

After the radio memory, the Tree Safe becomes solvable. Do not use a random online number here; read your frequency note, tune to the TREE frequency, and copy the number that appears in the receiver transcription.

1. Open the Tree Safe with the radio-derived number and take the Identification Card. Use the Protektor elevator. It will confiscate the card at B3.
2. Take the Shotgun from the B3 save room. Visit the imaging room to learn the Blank Key pattern from Object D.
3. Collect the Pump Room Key and Wrench Handle in the west side. Solve the pump puzzle to drain the water.
4. Drop into the drained bathroom. Take the Water Key, Examination Room Key, Video Cassette, and Blank Key.
5. Use the cassette in the TV room to obtain the Gold Key. Use the Examination Room to get the 10mm Socket and combine it with the Wrench Handle.
6. Open the Sword Safe using the SWORD radio signal plus the cipher note. Take the Eidetic Module and Incinerator Room Key.
7. Print the Earth/Blank Key pattern, solve the Incinerator, collect the Fire Key, then use the wrench to get the Air Key.
8. Insert Water, Gold, Fire, Air, and the printed Blank/Earth Key into the five-key door. Save before dropping into the Mynah boss.

Mynah strategy: hide behind pillars while she fires. When she kneels and opens her visor, shoot the weak point. Kill or burn adds only if they block your movement. Thermite can make the fight much cleaner, but do not waste every flare if you are playing Survival.

Sierpinski B5-B8: maintenance, owl box, astrolabe

After the Mynah fight and the elevator sequence, the game opens into the lower Sierpinski floors. Your big targets are the Maintenance Key, Fuse, Flashlight Module, Shutter Gate Handle, Owl Key, Island Key, Hunter Key, Broken Music Cassette, Hummingbird Key, Eagle Key, Postbox Key, Library Key, Astrolabe, and Administrator Key.

1. Take the Maintenance Key from the Protektor Office save room.
2. Go through the lower floors until you find the Fuse, then solve the fuse panel so the looping lifts work. Direct toggle solution: flip switches 2, 4, 6, and 7, then press the red switch.
3. Use the looping lifts to reach B8 and take the Shutter Gate Handle. Continue to Falke’s room and note the owl-like box.
4. Find the Flashlight Module in Adler’s room. From here on, keep one slot free for it whenever dark rooms appear.
5. Use the shutter handle to open a safe room and take the Owl Key.
6. In the dark B7 room, take the Island Key and Hunter Key. Use the Hunter Key on the Weapon Case from the shooting range to obtain the Einhorn Revolver.
7. Use the Owl Key to get the Broken Music Cassette, combine it with Adhesive Tape, then use the Island Key on the island painting to get the Workshop Key.
8. Play the repaired cassette in the Workshop. Return to Falke’s owl box and tune to the cassette frequency, commonly 142.000, until the box opens and gives the Hummingbird Key.
9. Use Hummingbird to get the Eagle Key. Take the Postbox Key from the adjacent dark room before leaving.
10. Open the postbox to get the Library Key. Use the library book grabber to retrieve the black book and take the Astrolabe.
11. Use the Eagle Key and Astrolabe in the shrine box. Match the planet layout from the orrery room to receive the Administrator Key.
12. Use the Administrator Key at the Mineshaft Access elevator. This unlocks LIMINALITÄT.

Mineshaft and Nowhere

The mine route is short and hostile. Take the left tunnel, reach the Mining Office safe room, collect the Flare Gun if you want it, then proceed through the elevator and access shaft. When the hatch opens, run through. You are not meant to map every corner.

Nowhere has no map and deliberately breaks spatial logic. Treat it as a hub-and-offering area. Your final objective is to collect six plates: Eternity, Flesh, Sacrifice, Balance, Knowledge, and Love.

1. Visit the Shrine Room and note the offering cup. You will return with Incense.
2. Take the Large Wooden Doll from the bath/tub area, then descend.
3. From the classroom save room, visit the Monitor Room. The microphone/radio screen gives shape codes. The direct 3×3 patterns are listed in the puzzle table below.
4. Drop into the flesh hole. The Chimera fight can be damaged with revolver shots, but Isa will eventually help. If you have no ammo, survive long enough and keep moving.
5. After the fight, get the Regent’s Ring, Rusted Key, and Plate of Flesh from the microfilament maze. Use the flashlight to see wire lines.
6. Return upward, find the Small Bottle, use it on Isa, and take the Nitro Express Rifle for the NITRO achievement.
7. Use the Rusted Key to get another Wooden Doll. Collect the Plate of Sacrifice through the square/diamond-coded maze.
8. Collect the Small Wooden Doll, combine the three dolls into a Completed Wooden Doll, and use it in the balance room so you can take the Plate of Balance without trapping yourself.
9. Collect the Wedding, Regent’s, and Serpent rings. In the hand puzzle, place Serpent on the little finger, Wedding on the ring finger, and Regent’s on the index finger. Take the Plate of Knowledge.
10. Use Incense at the Shrine Room cup to receive the Plate of Love.
11. Insert all six plates into the pillar door. The order shown by many routes is Sacrifice, Flesh, Eternity, Balance, Knowledge, Love. Continue to the false ending. When credits/menu change, choose Begin.

Return to Penrose and Rotfront

After the false ending, inspect the ship systems, reach the broken version of the Penrose, repair yourself, and continue through the beach. Sierpinski returns briefly as a corrupted echo: use the familiar classroom safe code 204512, then drop onward into Rotfront.

Rotfront is the final puzzle-heavy area. Your job is to gather six tarot cards, place them in Room 512, read their moon phases under UV light, then transfer those phases to the mural in the Atrium.

1. From the Atrium, establish the Bedroom save room and find the Submachine Gun if you want it.
2. Use the Handwheel to shut off the fire/gas route. Find Acetone and the Blue Diskette.
3. Use Acetone on the painting to get The Lovers card.
4. Find the Tower card in the cafeteria/public house route, then reach the Metro Platform and Computer Store save room. Take the Patient Key.
5. Unlock Room 512. This room contains the tarot table and the book that explains the planet-card matching.
6. Use the Blue Diskette in the computer. In Antenna, align the dishes to Tower 43, then in Transit send the Magpie file to 43.
7. Open the Commercial Corridor keypad with 560524 and collect Death.
8. Open the Butterfly Room safe with AEON to get Moon.
9. At the hospital/patient-room Magpie box, play the radio signal after the Magpie transmission. Most routes use 125.000; if it does not trigger, recheck that Magpie was sent to Tower 43. Take Star and the Store Key.
10. Use the Store Key in the Photo Store, combine Developer Fluid with the Developing Tank, then scan the developed photo to get Sun.
11. Place all tarot cards in Room 512, turn on the UV switch, note the moon phases, then return to the Atrium. Use the Dial Ring on Rotfront and set the mural phases from the table below.
12. Enter the opened hole, take The King in Yellow, then prepare for Falke.

Final boss: Falke

Bring strong healing, your best gun, ammo, and at least one empty slot. The fight is won with spears. Dodge until Falke summons spears, pick one up, shoot or wait until she drops to her knees, then use the spear on her. Each successful spear changes the arena and adds enemies or attacks. Kill only the enemies that block you, keep moving around projectile waves, and do not fill your inventory so completely that you cannot pick up the next spear.

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Direct puzzle answer sheet#

Use this table when you are stuck. Codes marked radio-derived should be read from your own playthrough.

Puzzle	Answer / method	Notes
Penrose cryo keypad	1, 3, 5, 8, 9	Read the back of the photograph for the intended clue.
Classroom 4B safe	204512	Used again later in the corrupted return.
Service hatch lock	Align all pin lines to the middle.	No fixed password; adjust tooth height until the lines match.
Radio station door	160.000	Tune radio and interact with the red-light post.
Tree Safe	Radio-derived: tune to TREE frequency and copy the receiver number.	The exact number can differ; do not rely on someone else’s displayed digits.
Pump Room	Left down, Middle down, Right up, Middle down, Left down, Middle down, Right up.	This drains the flooded bathroom route.
Sword Safe	Use SWORD radio digits with cipher A=1, N=2, B=3, H=4, S=5, R=6, Z=7, F=8, K=9, E=0. Common result: SRKFH.	If your radio output differs, decode your own sequence with the cipher.
Blank/Earth Key printer	Starting top-left: right, down, right, up, down, down, right, up.	Use Object D / x-ray imaging as the intended clue.
Incinerator	CO2 left 5, Gas right 5, O2 left 8, then pull the lever.	Or use the up/down indicator lights if your panel state changed.
B5 fuse panel	Flip switches 2, 4, 6, 7, then press the red switch.	Target is stable voltage for the looping lifts.
Owl box	Repair cassette, play it in Workshop, then tune near Falke’s owl box. Common frequency: 142.000.	This gives the Hummingbird Key.
Itou backyard keypad	560524	Used in Rotfront Commercial Corridor.
Butterfly Room safe	AEON	Look for letters in the butterfly wings.
Magpie box	Send Magpie to Tower 43, then play the received radio signal near the box. Common frequency: 125.000.	If it does not open, redo the computer transmission step.
Artifact safe	39486 60170 24326 01064	Requires the three hidden keys in inventory before entering Ariane’s room.

Nowhere radio door patterns

Use a 3×3 keypad numbered left to right, top to bottom:

Symbol	Frequency range	Buttons	Pattern
Helix	050	1, 3, 4, 5, 7	o-o / oo- / o--
Triangle	100	1, 2, 6, 7, 8	oo- / --o / oo-
Square / diagonal square	120	1, 3, 4, 5, 7, 9	o-o / oo- / o-o
Pentagon	160	1, 2, 5, 6, 7, 9	oo- / -oo / o-o
Hexagon	200	2, 4, 5, 6, 8	-o- / ooo / -o-
Star	240	1, 5, 6, 8, 9	o-- / -oo / -oo

Rotfront tarot and moon mural

Tarot card	Planet slot in Room 512	Where to get it
Sun	Buyan	Develop the photo and use it in the scanner.
Star	Heimat	Magpie box after sending Magpie to Tower 43.
Tower	Vineta	Cafeteria / public house route.
Lovers	Kitezh	Use Acetone on the painting.
Death	Leng	Itou bookstore/backyard sequence after keypad 560524.
Moon	Rotfront	Butterfly Room safe, code AEON.

Mural body	Moon phase	Plain description
Buyan	Full	All gold.
Vineta	Waxing gibbous	Blue shadow on the left.
Kitezh	Waning gibbous	Blue shadow on the right.
Rotfront	New	All blue.
Heimat	Waxing gibbous	Blue shadow on the left.
Leng	Waxing crescent	Mostly blue, small gold crescent on the right.

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Endings: Memory, Promise, Leave, Artifact/Lily#

Ending spoilers below. The normal endings are not selected by a single dialogue choice. They are calculated from playstyle counters when you enter the final cryogenics room. Community testing has updated these values over time; the practical advice below is safer than trying to balance the exact math mid-run.

Ending	How to aim for it	What not to do
Memory	Play quickly, avoid excess kills, avoid damage, avoid deaths, avoid exhausting NPC dialogue, and do not linger in memory scenes. The game starts biased toward this ending.	Do not farm deaths, near-death states, or broken-door checks.
Promise	Raise the Death/Promise side: kill many enemies, take significant damage, trigger near-death several times, and die more than five times. Longer total playtime can help.	Do not spend the whole run carefully healed and talking to every NPC if you are trying to keep Leave low.
Leave	Talk to NPCs repeatedly, check many broken doors, keep Elster healthy, use healing promptly, and spend extra time in the post-false-ending Penrose memory.	Do not rush under six hours or farm heavy death counters.
Artifact / Lily	On a profile with a completed game, collect three hidden keys and open the safe in Ariane’s room before the final boss.	Do not finish Rotfront’s eclipse/mural hole without carrying all three keys; you cannot backtrack from Ariane’s room.

Artifact / Lily ending steps

1. Key of Love: Leng/Sierpinski B2 Isolation Room, the room with four cages and red light. Tune to 096.000 and inspect the bottom-right cage.
2. Key of Eternity: Leng/Sierpinski B8 STCR Dorm, in the dark room past the STCR area. Tune to 065.000 and inspect the bookshelf between the beds/paintings.
3. Key of Sacrifice: Rotfront Ground Floor, Itou Store Backroom. Tune to 240.000 and inspect the space between the bookcase and boxes under the white books.
4. Carry all three keys before you complete the Rotfront mural/eclipse hole.
5. After crawling into Ariane’s room, turn right and find the safe before taking the book.
6. Use the three keys and enter 39486 60170 24326 01064.

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Achievements and platinum cleanup#

Achievements unlock outside the game flow on some platforms, so do not panic if the notification timing feels strange. For one-run completion, start on Survival combat accessibility with Classic inventory and never lower those settings.

Achievement	Requirement	Missable?
SYNCHRONIZITÄT	Finish the prologue.	No
BESCHLAGNAHMT	Use the Protektor elevator to B3 and lose the ID card.	No
ABWÄRTS	Finish the Mynah sequence and continue downward.	No
LIMINALITÄT	Use the Administrator Key to descend into the mineshaft.	No
DAS ENDE	Reach the false ending.	No
GESTALTZERFALL	Choose Begin after the false ending and continue the post-false-ending sequence.	No
VERSPRECHEN	Defeat Falke and receive an ending.	No
SCHWERER AUSNAHMEFEHLER	Die once.	Yes, but easy to farm
LÖCHER	Die and reload on the same save until all 16 diagnostic triangles are filled.	Yes
EINHORN	Collect the 12mm Einhorn Revolver by opening the Weapon Case with the Hunter Key.	Yes
NITRO	Use the Small Bottle on Isa in Nowhere and take the Nitro Express Rifle from her.	Yes; the late rifle pickup does not count for this achievement.
ÜBERLEBEN	Complete the game on Survival with Classic inventory from start to finish.	Yes
ACHTUNG	Unlock all other achievements.	Completion

Official trailer#

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Sources & credits#

Game details and screenshots are from the official Steam page / app data for SIGNALIS by rose-engine. The route, puzzle tables, Nowhere patterns, Rotfront tarot solution, ending requirements, and achievement notes were cross-checked against fetched community walkthroughs and then rewritten here as a structured survival guide rather than copied as source prose. Live pages blocked by Cloudflare were treated only through readable snapshots or not used as source text.