This is a clean, step-by-step achievement walkthrough based on a full completion run. I’m not going to explain the full story or every mechanic, just everything you need to hit 100% in one playthrough without missing anything important.
- Suite 1402
- Academy Street (1st Visit)
- Base Camp + Songreung Cathedral
- Academy Street (2nd Visit)
- Charlotte Department Store
- Notes (14–26)
- Disposal
- The Department Store’s Master
- Arin Shin
- Sehee Jang
- Clan Master’s Armour
- Important Step (True Ending Setup)
- Delivering the Weird Gift
- Songreung Cathedral + Sol-City Apartments
- Gunwoo Park
- Notes (27–44)
- Plant Exterminator
- The Red Dot Following Me
- Pendant of Protection (IMPORTANT)
- Yeseol Han
- Tower of Classrooms
- Tower of Classrooms
- Notes (45–62)
- Key Events
- Second Filter Vision
- Dark Song
- The Queen’s Mirror
- Blade Replenishment (IMPORTANT)
- Note Collector
- Finale
- Ending Requirements (CRITICAL)
- Puzzle Solutions
- Difficulty: Around 3.5/10
- Time to 100%: 8 to 12 hours
- Achievements: 35 total, all offline
- Playthroughs needed: 1
- Missables: Yes, anything not tied to story
- Bug warning: “Sweet Home” may not unlock properly
If that bug happens, delete your save file from:%USERPROFILE%\AppData\LocalLow\DevespressoGames\TheComa3
Then restart the game.
Suite 1402
Sweet Home
Unlocks when you start the game. Cannot be missed.
The Mysterious Grandmother
Happens after escaping the roamer in your apartment and watching the cutscene. Story-related.
Academy Street (1st Visit)
Study Group
Triggered after entering Cafe Red Moon and talking to your friends.
Notes (1–7)
You’ll start collecting notes here. These are required for Note Collector, so don’t skip them.
- Note 1: Above Hand Brewing Coffee Bar
- Note 2: Inside Classroom A (window)
- Note 3: Right of hallway after Classroom A
- Note 4: JG Hallway entrance
- Note 5: After talking to Kwangsoo, near stairs
- Note 6: Outside Red Moon Cafe
- Note 7: Near elevator during chase sequence
If you miss Note 7 because of the chase, don’t worry, you can grab it later.
Important Choice Warning
When speaking to the NPC hitting the pig, do NOT choose:
“I heard that the director had a special hobby”
This locks you out of an achievement later.
Slush Fund Warehouse
Interact with the pile of money in the storage room.
Optional, but note that taking money might affect your ending.
Uncle Kwangsoo
Story progression after meeting him.
Unwelcome Guests
Triggered after returning to the start area and watching the cutscene.
Base Camp + Songreung Cathedral
Base Camp
Unlocked after escaping the Shades.
Ghost Vigilantes of Sehwa Foundation
Unlocked automatically at the cathedral.
Academy Street (2nd Visit)
Now you can safely clean up anything missed earlier.
Notes (8–13)
- Note 8: Left of Comma Cafe stairs
- Note 9: Study Room C
- Note 10: Near green bike after encounter
- Note 11: Fire escape as Mina
- Note 12: Security room (former money room)
- Note 13: JG hallway
The Two Meet Again
Triggered after meeting Mina again.
The Sword of the Clan Master
Unlocked after defeating the blind Shade.
Charlotte Department Store
This section has a lot of notes, so stay alert.
Notes (14–26)
Spread across floors, escalators, shops, and key progression rooms. Just explore each level fully before moving on.
Disposal
Break chains with bolt cutters.
The Department Store’s Master
Meet Mr. Bang.
Arin Shin
Meet Arin shortly after.
Sehee Jang
Free Sehee in the 4F area.
Clan Master’s Armour
Defeat the General boss.
Important Step (True Ending Setup)
At Base Camp:
Delivering the Weird Gift
Talk to Youngho and choose “About the favor”
He gives Mina a can of cream
This is required for the true ending.
Songreung Cathedral + Sol-City Apartments
Gunwoo Park
Triggered after returning to the cathedral.
Notes (27–44)
Most of these are inside apartments, hallways, and puzzle areas. Check every room carefully, especially:
- Room 102
- Room 104
- Room 201
- Room 204
- Room 601
- Room 703
- Room 1402
Plant Exterminator
Destroy the eyeball plant.
The Red Dot Following Me
Sniper survival sequence.
Pendant of Protection (IMPORTANT)
After exiting apartments, go LEFT before triggering cutscene.
Pick up the pendant.
This is required for the true ending.
Yeseol Han
Triggered by story progression after apartments.
Tower of Classrooms
Tower of Classrooms
Unlocked after returning to base camp.
Notes (45–62)
This is the final stretch for notes. They are spread across:
- Broadcast Room
- Security Room
- Biology Lab
- Hallway of Holes
- Old Storage
- Shelter path
Take your time here because missing one means no Note Collector.
Key Events
Second Filter Vision
Triggered after repairing mascot helmet.
Dark Song
Meeting Arin again.
The Queen’s Mirror
Puzzle inside Old Storage.
Blade Replenishment (IMPORTANT)
Talk to Arin as Youngho in the classroom section.
She gives a blade fragment
This is required for the true ending.
Note Collector
Unlocked after getting all 62 notes.
Finale
The Vicious Sister and Sumi Park
Story progression.
Killer Song Time
Triggered during final sequence.
Ending Requirements (CRITICAL)
To get the True Ending, you must:
- Give Mina the cream
- Collect the Pendant of Protection
- Get the Blade Fragment from Arin
If all three are done:
Jihyun Song
Mina Park
Youngho Choi
All survive.
Those of the Bloodline
True ending unlocked.
Goodbye, Everyone!
Unlocked after playing the post-credit epilogue.
Puzzle Solutions
Here are all required codes and solutions:
Academy Street
- Door Code: 5328*
- Classroom A: 3910*
- Staff Room: 814745*
- Staff Computer: 918440
- Comma Cafe Room A: 3562#
Maintenance Gate
- Right lever → right
- Dial → ON
- Press top-left + bottom-left buttons
Leon Section
- Computer: 5837
- Door: 52381*
Safe Codes
- 2F Safe Room: 0709
- Stalker Safe: 05135
- Room 1402: 2041*
- Bathroom (604): 1982
Store / Puzzle Areas
- Balloon Code: 1303
Burger Recipe
Order:
Meat → Hashbrown → Cheese → Tomato → Bacon → Lettuce → Top bun
Machine Puzzle (4F)
- Top left + bottom left switches ON
- Dial ON
- Sliders:
- Top right → middle
- Bottom left → middle
- Bottom right → max
Door Lock (Final Puzzle)
- Top row: switches 1, 2, 4 ON
- Bottom row: switch 2 ON
- Top slider → max
- Bottom slider → middle