Underground Blossom is short, but it is not a straight line if you are trying to finish every station, every cube, the ARG-style extra rooms, and the later Lab update without bouncing between five different notes. This guide keeps the main route compact enough to play from, then gives you a separate cleanup checklist for cubes, Underground extras, Best Kept Memory, The Lab, and all 35 Steam achievements.
Before You Start
There is no difficulty setting, and the route is generous for achievement hunters. Community achievement guides and the Steam achievement page agree on the important point: nothing meaningful is permanently missable, because the map lets you return to stations after the main ending. Still, you can save a lot of time by clicking the odd optional interactions during your first pass.
- Steam achievement count: 35, including the The Lab update achievement.
- Main route: 7 metro stations tied to Laura Vanderboom’s life.
- Post-game route: collect 7 station cubes, place them in Mr. Owl’s case, then clean up Underground extras.
- Secret station phones: Child Lane phone can reach Best Kept Memory with 74222 and The Lab with 36133.
- Useful carryover items: after the ending, keep track of the bucket, crowbar, and paintbrush. They unlock several cubes.
Fast Codes And Times
| Where | Code, time, or sequence | Use |
|---|---|---|
| Crib Station | 10:15 | Set the station clock after opening Rose’s pendant. |
| Child Lane | 24355 or 53114 | Dial the phone number shown by your poster puzzle. Captured guides show both variants, so follow your in-game reveal. |
| Child Lane | 8827 | Suitcase code from the statue base. |
| Child Lane | 12:20, then 4:05 | Develop the film, then call the train. |
| School Street | 637 | Notebook lock from lollipop, sharpener, cigar measurements. |
| School Street | 2:45 | Train departure time after returning Laura’s photos. |
| Bird Bridge Station | 1-2-3-1-2-3 | First trumpet tune from the singer poster. |
| Bird Bridge Station | 5:00 | Businessmen arrival. |
| Bird Bridge Station | 587, 192, 361 | Electrical cabinet number rounds. |
| Bird Bridge Station | 1-1-2-2-3-3, then 3-3-1-3-1-1 | Second and third trumpet tunes. |
| Bird Bridge Station | 3:45 | Train departure time from Laura’s notebook clues. |
| Sorrow Cross | 4:00, 9:00, 19:55 | Bob’s train, thief pickup, then final train after painting the portrait. |
| Soul Street | 4195 | Locker 8 code from the tattoo/object matching puzzle. |
| Post-game mask | 5372 | Reopen the green box at Soul Street for the mask. |
| Best Kept Memory | 74222, 8:35, 8357992442 | Call from Child Lane, take the train, then unlock the room keypad. |
| The Lab | 36133, 2:40, 3:45 | Call the Lab, take the Lab train, then return to the main metro after the chapter. |
Main Walkthrough
This route is written as a practical checklist, not a transcript. If a puzzle has randomized pieces, the rule is more useful than one screenshot-specific answer, so I describe the rule and the stable target.
Chapter 1: Crib Station
Open the suitcase for the matches and milk. On the right side, open the box for the cloth and saw, cut the grate bar, take the rod, and use it to pull the key through the grate. Return to baby Laura, take the safety pin, give her the milk, make the diaper with the cloth and safety pin, then keep interacting until you can take the dirty diaper.
Burn the dirty diaper in the trash can with the matches, break the can, and take the scraper. Use the scraper on the poster until the hidden symbol is visible. Copy the shape, open Rose’s pendant by selecting the same symbol parts, and note the watch time: 10:15. Set the station clock to 10:15.
When the train arrives, inspect the conductor’s pocket for a coin. Use the earlier key on ticket booth 1, wake the attendant with the rod, buy a ticket with the coin, punch it on the train, and leave. For cleanup, poke baby Laura several times before leaving if you want the odd optional achievement now.
Chapter 2: Child Lane
Scrape the old gum from the glass, give it to Laura, and use the chewed gum to hang the poster. The “Holidays From Big to Small” poster puzzle asks for objects from smallest to largest: glass, hat, kite, camel, plane, pyramid, sun. This gives you the key and also triggers the chapter’s story achievement.
Use the key in the phone booth. The phone number is revealed by the other poster puzzle; sources show 24355 and 53114, so use the number your game displays. The call points you back to the statue. Click the statue eyes, pry open the base with the pipe, and use 8827 on the suitcase for the camera.
Give the camera to Laura, collect the film after the scene, and retrieve the screwdriver and timepiece from the bag after Rose leaves. Use the screwdriver on the phone box for the stained-glass piece, complete the hotel mosaic for the clock hand, then solve the ticket-machine shape equation by entering the X-shaped result. Put the film in the photo service, set the clock to 12:20, collect the developed message, then set the clock to 4:05 and depart.
Chapter 3: School Street
Pick up the peanut, fold the paper into a plane, and open the sausage tin with the screwdriver. The school gossip puzzle is about identifying students from reactions: one student has a peanut allergy, one is afraid of paper planes, one hates sausage, one is hiding a stolen earring, and the note in a pocket explains the crush clue. Use those reactions to place the photos correctly in the gossip book.
After the book is solved, recover the peanut, plane, and sausage and trade them to the gossip-book student to get the worm. Feed the bird, drop the egg, then click the hit student repeatedly if you want the optional “Not cool Johnny” achievement. Open the bag, measure the lollipop, sharpener, and cigar, and enter 637 into the notebook. Return the photos to Laura, solve the arrow-button ticket machine by following the arrows until every button is pressed once, then set the clock to 2:45.
Chapter 4: Bird Bridge Station
Take the pencil and sausage from the box. Draw a single line in Laura’s notebook, take the line, and combine it with the branch from the manhole to make the fishing setup. The singer poster gives the first trumpet sequence: 1-2-3-1-2-3. After the fish comes out, take the hook, complete the rod with the sausage, fish out the rat, and follow it to the wall note. Set the clock to 5:00.
The businessmen chain is a relay: follow each passenger’s clue, pass the glasses and tie, get the lighter, buy Bob a sandwich and Laura a coffee, remove the worms from the sandwich, and take the cigarette from the coffee. Give the cigarette and lighter to the shady man, then use the paperclip on the electrical cabinet. The number rounds are 587, 192, and 361.
After the cabinet, play the loudspeaker tune on the trumpet as 1-1-2-2-3-3. Feed the bird with breadcrumbs, then play its tune as 3-3-1-3-1-1 to receive the ticket. Laura’s notebook points to the tree and dark soul clues, giving the final time 3:45.
Chapter 5: Sorrow Cross
Take the hour hand under the bench, install it, and set Bob’s train to 4:00. After Bob leaves, take the coin and money from the wallet. In the vending machine, buy snacks that total 100 credits; the stable set in the captured route is 20, 45, and 35. Sort the candy by theme: animals with the animal packet, transport with the bicycle packet, food with the food packet.
Give the corn cookie to the pigeon. The pellet puzzle can vary, so solve it by rule: the pigeon must land on edible pellets, skip over the unsafe pieces, and never land on an empty slot. Follow the pigeon until the train accident, take the key, free the thief, leave the money under the bench, set the clock to 9:00, and recover the saw.
Use the saw on the cabinet lock, add the missing painting panel, and search the large painting through the central viewfinder until all 12 border images are matched. Pair the trash into matching sets, take the pill, and give it to Laura. Her nightmare sequence is a drag-and-match puzzle: baby to Rose, heart to Bob, hand and face to Rose/young Laura, fish to the detective, rat to the bird, Rose’s face to the corrupted soul, blossom to Harvey, and black cube to old Rose. Take the ticket. Click the remaining dark figure repeatedly for “Creepy vermin,” then paint Rose’s portrait with the bloodied brush. The correct final time is 19:55, or 7:55 on a 12-hour clock.
Chapter 6: Soul Street
Take the crowbar from the lockers, break the barrel, light the oil, and pry open the floor box for a key. Use it on locker 6 for the bucket. The moth puzzle uses directional stones; move the moth to the marked hole by reading the stones as arrows, not as walls. Transform the soul by clicking it, then take the next key and open locker 7 for pincers.
Cut the lock, enter the room, and remove the tape from the prisoner. Use the duct tape on the first broken wire, route power through it, open the wall box, and take the valve. Put the valve on the pipe, fill the bucket, and use water where needed to get the iron wire. The later wire routes are the heart of the chapter: one route powers the mechanism without the light, and the last route sends power to the light.
Continue the prisoner interactions until he gives the clue. Behind the poster, take the key and more duct tape. The wall images lead to the tattoo puzzle; match dog, bird, boat, and tree to their tattoo counterparts, then open locker 8 with 4195. Give the timepiece to the soul, light the four corner segments, and board the train.
Chapter 7: The Lake
The final main station is mostly story resolution. Talk to the soul, go to the tree, speak with the two women, return to Laura, and ride the train. Click any black butterfly you see during the end sequence if you are cleaning achievements; some community notes treat “The Future in The Past, The Past in The Future” as slightly finicky, so do not ignore the butterfly prompt when it appears.
Cubes And Underground Cleanup
After the ending, take the underground map from the suitcase. You can now revisit stations. Mr. Owl at The Lake asks you to recover one cube from each station, but the solutions deliberately cross station boundaries.
| Cube | Station achievement | Route |
|---|---|---|
| Bronze cube | Crib Station – 4 | Fill the bucket at Soul Street, pour it into the Bird Bridge manhole for the fishing net, catch the fish at Soul Street, use the crowbar on the fish for a key, then unlock booth 2 at Crib Station. |
| Marble cube | Child Lane – 4 | Use the crowbar on the open cabinet at Sorrow Cross to reveal a 3×3 pattern. Enter the inverse colors on the Child Lane ticket machine. |
| Ice cube | School Street – 4 | Fill the bucket at Soul Street, pour it into the Crib Station grate, read the five direction symbols, then enter that sequence on the School Street ticket machine. |
| Stone cube | Bird Bridge Station – 4 | Get Mr. Owl’s coin at The Lake, buy the nut bar at Sorrow Cross, give it to Jimmy at School Street, then play his scream as 2-2-2-1-2-3 on the Bird Bridge trumpet. |
| Bone cube | Sorrow Cross – 4 | Use the crowbar on the Bird Bridge rathole tile for the $50 bill, buy a donut, give it to Bob, then set Sorrow Cross to 12:00 and talk to the new figure in the cell. |
| Copper cube | Soul Street – 4 | Paint Mr. Owl’s statue eyes red at Child Lane, take the key, then open locker 9 at Soul Street. |
| Wooden cube | The Lake – 4 | Use Laura’s notebook sketch from Bird Bridge as the clue, then dig left of the blossoming tree at The Lake. |
Return to Mr. Owl’s case at The Lake and place all seven cubes. This gives the shrimp and unlocks “One shrimp, please.” To reach the hotel, take the shrimp to the booth 2 clerk at Crib Station, receive the golden ticket, set the clock to 2:25, and follow the train and boat sequence to “Back to work.”
The “Ascension” puzzle uses the same symbol logic as a Cube Escape Collection puzzle. The checked text sources rely on image diagrams for the exact arrangement, so a text-only layout is risky; arrange the cubes until the case closes, then go left at The Lake and click the wandering souls until the hidden door appears.
For “Behind the mask,” return to Soul Street, close the green box if it is open, enter 5372, take the mask, and give it to Rose at Crib Station.
Best Kept Memory
From Child Lane, dial 74222, then set the clock to 8:35. At Best Kept Memory Distribution Center, use the keypad code 8357992442 to enter the locked room. Community guides differ on which label fires first, but the practical cleanup is simple: do both lamp and tape tasks.
- Locked room task: enter 8357992442, go in, and click the lamp several times.
- VHS task: use the tape archive, enter box 23, take the Vendome_Ba or Vendome_Barro tape, and watch it on the TV.
- Extra keys: after the tape task, check the folder, then box 66, and use both keys on the cabinet in the locked room if you want the full scene.
The Lab – Research Facility
After you have access to station travel, call 36133 from Child Lane and set the clock to 2:40. At the Lab, take the coffee filter from the janitor, collect the cup and coffee, fill the cup from the toilet, brew coffee, and give the janitor a cup plus coffee. When he leaves, take the mop and the key from his overalls, then enter the Research Facility.
The facility works around fuses. Start by using the fuse to open the route to the glass and fan, jam the fan with the mop, and take the second fuse. Put fuses in the second and third slots to reach storage. Use the cutout clue on the floor to open the boxes, taking the ID/key card and valve. Free the corrupted soul with the valve, take the kidney, then move the fuses to the lower route described by the floor plan so you can reach the potion room and later the vent with matches.
In the potion room, take the floppy disk and toilet paper, place the coffee pot and kidney, give the janitor the toilet paper, refill the glass with water, and return. The mixture order is cold coffee, hot water, then cold green liquid. Only the water needs to be heated. Push the flesh mass with the mop; before it reaches the fan route, move one fuse back to the top slot so the route opens, then push the mass into the fan and enter the vent for the third fuse.
With three fuses, power the bottom three slots and reach memory extraction. Follow Rose’s instructions, take the black cube, close the cell gate after the blood trail scene, take the key, unlock the double doors, and use the cubical device with the black cube and floppy disk. That ends the Lab chapter and unlocks “Run Harvey Run.” If you want to return from The Lab to the regular metro, sources point to setting the station time to 3:45 after the chapter.
Achievement Cleanup Checklist
| Achievement group | What to do |
|---|---|
| Crib Station | Complete the chapter, make baby Laura poop, click baby Laura repeatedly, and later collect the Bronze cube. |
| Child Lane | Complete the chapter, solve Holidays From Big to Small, click the photo service sign many times after opening it, and later collect the Marble cube. |
| School Street | Complete the chapter, identify all students, click Johnny after the egg hits him, and later collect the Ice cube. |
| Bird Bridge Station | Complete the chapter, get the ticket through all three trumpet tunes, play random trumpet notes for the optional music achievement, and later collect the Stone cube. |
| Sorrow Cross | Complete the chapter, solve the vending/candy puzzle, click the dark remains after Laura’s nightmare scene, and later collect the Bone cube. |
| Soul Street | Complete the chapter, make the prisoner talk, repeat the prisoner interaction for the optional technique achievement, and later collect the Copper cube. |
| The Lake | Complete the chapter, make the tree blossom, click the black butterfly when it appears, and later dig up the Wooden cube. |
| Underground extras | Place all seven cubes for the shrimp, reach the hotel for Back to work, solve the cube-symbol ascension, use mask code 5372, unlock Best Kept Memory, watch the Vendome tape, and click the locked-room lamp. |
| The Lab | Call 36133, take the 2:40 train, finish the Research Facility route, and use the black cube/floppy device. |
Common Mistakes
- Using the wrong Child Lane phone number: use the number revealed in your save. The checked walkthrough captures show two variants.
- Leaving items on students in School Street: after testing peanut, plane, and sausage reactions, pick the items back up before trading them for the worm.
- Trying a fixed Sorrow Cross pellet order: the useful rule is landing logic. Arrange the pellets so the bird never lands on a stone or empty slot.
- Setting Chapter 5 to 8:55: the portrait reveal is 19:55, which is 7:55 in 12-hour notation. Use 19:55 if you read the clock as 24-hour time.
- Forgetting the post-game tools: the bucket, crowbar, and paintbrush solve several cubes. Do not treat them as leftover junk.
- Heating all Lab liquids: for the Lab potion, heat the water only. The sequence is cold coffee, hot water, cold green liquid.
Sources And Credits
Official metadata and screenshots were checked against the Underground Blossom Steam page and Rusty Lake’s official website. Route details were cross-checked against community walkthrough references, including AppUnwrapper, Neoseeker, WalkthroughKing, VGTimes, PlayGames Wiki, Rusty Lake Wiki, and Steam Community guide captures. Steam Community pages that carried removed or incompatible warnings were used only as cautious cross-checks, not as official sources.