Quick Answer
Five chapters are confirmed by two independent community walkthroughs: The Hospital, The Basement, The Sewer, The Sewer Hideout, The Organism.
DanQ8000's full-game footage shows chapter-select markers for exactly these five chapters, and the Neoseeker written guide independently matches the same structure. It is not officially confirmed by Emberflight Games. This page gives objectives, missables, and next steps per chapter, and links to dedicated puzzle, achievement, and collectible pages.
Before You Start
Estimated Time
4-6 hours (8-10 for completionists)
Difficulty
Medium-High
Missables
- Five family collectibles across The Sewer and The Sewer Hideout — all missable after chapter transitions.
- Handshot, Touchy Subject, Sharp Senses, What is he made of?!, Early Grave, Rest in Pieces.
- Fully Upgraded — only spend Upgrade Bolts on one weapon (the handgun).
Achievements
20 Steam achievements; 4 hidden (What is he made of?!, Forgiveness, Rest in Pieces, Early Grave).
Spoiler Warning
This walkthrough contains story and progression spoilers. Read only as far as you need, and check the Puzzle Solutions page if you want to solve specific sections yourself.
Chapter Overview
| Chapter | Playtime | Puzzle | Boss / Set-Piece | Collectibles | Difficulty |
|---|---|---|---|---|---|
| 1. The Hospital | 45-60 min | — | — | — | Low |
| 2. The Basement | 1-1.5 hours | Cage Lock Code, Electrical Room Door Key | Mutant (first encounter) / William Blake (stalking) | — | Medium |
| 3. The Sewer | 1.5-2 hours | Sewer 4-Digit Door Code, Half-Pipe Alignment | — | Son's Family Drawing, Worn Football | High |
| 4. The Sewer Hideout | 1-1.5 hours | Valve Drainage, Venus Hand Traps, Machine Room Door Code | Cage Monster (Early Grave) / William Blake (chase) | Photograph of the Family Dog, Toy Police Car, Toy Carousel | Very High |
| 5. The Organism | 45-60 min | Red Blister Finger Gates | Cage Monster (explosives area) | — | Very High |
1
Chapter 1: The Hospital
Estimated Time
45-60 min
Difficulty
Low
Overview
Officer Thompson arrives at St. Mary's Hospital on a trespass report, enters the building, and reaches the upper examination wing before being taken.
Objectives
- Courtyard entry past the boarded main entrance (Trespassing achievement on entry)
- First-floor exploration: Search Warrant note, vaulting tutorial
- Second floor examination room: Internal Compliance note, leg-stuck QTE
- Ouija board room event and the room with the crying voice
Key Puzzles
No named puzzles in this chapter — exploration and pursuit sequences.
Danger Areas
- Environmental hazards and pursuit sequences.
Tips
- No missable collectibles in this chapter.
Evidence Note
Chapter 1: The Hospital -- estimated 45-60 min, difficulty Low.
Chapter boundaries are based on chapter markers visible in community walkthrough footage (single source, not officially confirmed). We do not publish unverified room names, codes, or exact steps.
2
Chapter 2: The Basement
Estimated Time
1-1.5 hours
Difficulty
Medium
Overview
Thompson wakes in a cage in the basement prison. Solve the cage padlock, escape the prison area, evade the Mutant through the maintenance wing, and retrieve your pistol.
Objectives
- Cage padlock code puzzle (solution on the Cage Lock Code page)
- Escape the prison area (Escape Artist achievement)
- Retrieve your pistol (Happy Reunion achievement)
- First Mutant encounter: locker hiding, hold-breath mechanic, Electrical Room key
- Three-generator experiment area patrolled by William Blake
Key Puzzles
- Cage Lock Code (Basement Prison) — solution: O = 2, Square = 5, Triangle = 8
- Electrical Room Door Key (Basement) — mechanic guide
Danger Areas
- Mutant (first encounter) / William Blake (stalking)
Tips
- No missable collectibles in this chapter.
- Missable here: Sharp Senses — Let a Minion grab you (first ones appear in the Basement), then press the prompted button to kill it with your knife. Saves ammo.
- Missable here: What is he made of?! — Once you have the handgun in the Basement's experiment area, shoot William Blake. It does nothing — but you get the achievement.
Evidence Note
Chapter 2: The Basement -- estimated 1-1.5 hours, difficulty Medium.
Chapter boundaries are based on chapter markers visible in community walkthrough footage (single source, not officially confirmed). We do not publish unverified room names, codes, or exact steps.
3
Chapter 3: The Sewer
Missable ContentEstimated Time
1.5-2 hours
Difficulty
High
Overview
Deep underground tunnels patrolled by big hands and minions. Find the shotgun, open the 4-digit code door, align the half-pipes, and rescue Sam from the burning police car.
Objectives
- Big hand enemies introduced (Touchy Subject achievement if one kills you)
- Shotgun found in the maintenance area (Armed and Ready achievement)
- 4-digit door code 5861; son's family drawing inside (In Good Hands + What's in the Hole? achievements)
- Half-pipe alignment puzzle in the lower service channel
- Worn football collectible in the half-pipe area (A Great Team! achievement)
- Sam rescue and CPR; reach William Blake's hideout (Science and History achievement)
Key Puzzles
- Sewer 4-Digit Door Code — solution: 5861
- Half-Pipe Alignment (Sewer Lower Service Channel) — solution: Switches (both) → buttons 1, 4, 1, 3
Danger Areas
- Environmental hazards and pursuit sequences.
Collectibles
- Son's Family Drawing — unlocks "In good hands.". Location: Inside the 5861 code-door room in the Sewer maintenance area.
- Worn Football — unlocks "A great team!". Location: Half-pipe area — the room behind the back-wall door in the water below.
Tips
- Collect all 2 items before leaving — chapter transitions are points of no return.
- Missable here: Touchy Subject — Walk up to a big hand in the Sewer and let it kill you. It is happy to oblige. You restart at the area's checkpoint.
- Missable here: In good hands. — Inside the Sewer's 5861 code-door room: interact with the fleshy wall to reach inside and pull it out.
- Missable here: A great team! — In the Sewer half-pipe area, drop into the water, open the back-wall door, pull the switch to open the pipe cover, then reach inside the wall.
Evidence Note
Chapter 3: The Sewer -- estimated 1.5-2 hours, difficulty High.
Chapter boundaries are based on chapter markers visible in community walkthrough footage (single source, not officially confirmed). We do not publish unverified room names, codes, or exact steps.
4
Chapter 4: The Sewer Hideout
Missable ContentEstimated Time
1-1.5 hours
Difficulty
Very High
Overview
William Blake's hideout. Drain the flooded areas with the valve puzzles, cross the hand-infested pools, collect three of the five family items, and escape Blake's chase.
Objectives
- Valve drainage puzzle: four valve-handle sets (exact rotations on the Valve Drainage page)
- Venus Hand Traps introduced (Handshot achievement)
- Family dog photograph behind a wall reach (Fetch! achievement)
- Toy police car in a fleshy wall (Bring Your Child to Work Day achievement)
- Toy carousel collectible (Round and Round We Go achievement)
- Cage Monster fight in the steam pipe area: kill it with gunfire (Early Grave achievement)
- Unlimited-stamina chase from William Blake at the end
Key Puzzles
- Valve Drainage (Sewer Hideout) — solution: Set1: L×2(down), R×1(left) · Set2: ×1(up), -, ×1(left) · Set3: ×1(up), ×2(down), ×1(down), ×2(left) · Set4: ×1(down), ×1(left)
- Venus Hand Traps — mechanic guide
- Machine Room Door Code (Sewer Hideout) — solution: 3752
Danger Areas
- Cage Monster (Early Grave) / William Blake (chase)
Collectibles
- Photograph of the Family Dog — unlocks "Fetch!". Location: Flooded lower area — the far side below the catwalk you shimmy across.
- Toy Police Car — unlocks ""Bring your child to work" - Day". Location: Dark corridor to the right of the desk with the Guilt note, after the disappearing-bridge section.
- Toy Carousel — unlocks "Round and round we go.". Location: Sewer Hideout machine room — behind the 3752 code door.
Tips
- Collect all 3 items before leaving — chapter transitions are points of no return.
- Missable here: Handshot — Shoot a Venus Hand Trap (the hands along the floor that grab and hold you). First ones appear in the Sewer Hideout drainage pool area.
- Missable here: Early Grave — In the Sewer Hideout steam pipe area, when the Cage Monster busts through the door, kill it with gunfire. This fight happens before the chapter's end.
- Missable here: Fetch! — In the Sewer Hideout flooded lower area, lure the hands in the water away with stones, cross to the far side, and reach inside the wall.
- Missable here: Round and round we go. — Found in the Sewer Hideout playground/sandbox area while working through the platform-switch sequence.
- Missable here: "Bring your child to work" - Day — Reach inside the fleshy wall in the dark corridor right of the desk with the Guilt note (Sewer Hideout, after the disappearing-bridge section).
Evidence Note
Chapter 4: The Sewer Hideout -- estimated 1-1.5 hours, difficulty Very High.
Chapter boundaries are based on chapter markers visible in community walkthrough footage (single source, not officially confirmed). We do not publish unverified room names, codes, or exact steps.
5
Chapter 5: The Organism
Estimated Time
45-60 min
Difficulty
Very High
Overview
The final chapter inside the organism itself. Open finger gates by shooting red blisters, defeat the Cage Monster with explosive barrels, and complete the game (Forgiveness).
Objectives
- Finger gates opened by shooting red blisters
- Cage Monster fight in the explosives area: final hit must be a red-barrel explosion (Rest in Pieces achievement)
- Completing the game unlocks Forgiveness (hidden)
Key Puzzles
- Red Blister Finger Gates (The Organism) — mechanic guide
Danger Areas
- Cage Monster (explosives area)
Tips
- No missable collectibles in this chapter.
- Missable here: Rest in Pieces — In The Organism's explosives area, damage the Cage Monster with gunfire but make the FINAL hit a red explosive barrel. Shooting a barrel stuns it — with a strong shotgun you can burst it down between stuns.
Evidence Note
Chapter 5: The Organism -- estimated 45-60 min, difficulty Very High.
Chapter boundaries are based on chapter markers visible in community walkthrough footage (single source, not officially confirmed). We do not publish unverified room names, codes, or exact steps.
Completion Checklist
Before finishing The Organism, make sure you have:
- All five family collectibles (see the Collectibles hub).
- The missable achievements: "Bring your child to work" - Day, Fetch!, Round and round we go., In good hands., A great team!, Handshot, Touchy Subject, Sharp Senses, What is he made of?!, Early Grave, Rest in Pieces, Fully Upgraded.
- One fully upgraded weapon for Fully Upgraded.
Spoiler policy
This walkthrough contains story and progression spoilers. For puzzle solutions without story context, use the Puzzles hub.
Sources & Disclaimer
Sources
- Steam store page for It Reaches (App ID 4119360)
- DanQ8000, 'IT REACHES Full Game Walkthrough' (YouTube, chapter markers)
- Neoseeker It Reaches Walkthrough and Guide (Berserker, last edited Aug 17, 2026)
- Steam Community global achievement statistics
Last reviewed: 2026-09-08
Unofficial Fan Guide
This guide is an unofficial fan resource and is not affiliated with, endorsed by, or sponsored by Emberflight Games or Perp Games. All game names, characters, screenshots, and trademarks are property of their respective owners. Chapter structure and guide details are based on the current Steam description and community sources; exact content is being verified as the full release becomes available.
