In Sink: A Co-op Escape Adventure is a two-player escape-room game where the hard part is rarely one person being clever. The real challenge is turning two half-screens of information into one clean plan. This walkthrough is written for a real co-op pair: it gives you the route, the puzzle logic, the confirmed code-style solutions from readable references, the hidden achievements, and the places where the available community text becomes thinner.
Spoiler warning: this guide discusses level structure, puzzle mechanics, several exact codes, the Level 1 hidden achievement, the Egg achievement route, and post-game cleanup. If you only want light nudges, read the “Co-op rules that solve most rooms” section first, then jump into a level only when you are stuck.
Best Route For a First Clear
If you want the shortest practical plan, use this order. It keeps the puzzle-solving work organized and saves the hidden-achievement cleanup for the right moment.
- Agree on a communication format before starting. Use rows, columns, left-to-right order, shape names, and color names consistently. Do not improvise a new naming system every room.
- Play Level 1 slowly. It teaches simultaneous buttons, number exchange, color/shape ordering, split-role levers, recipe reading, map navigation, and the first hidden achievement.
- Get the “In Sink” hidden achievement during Level 1. In the kitchen room, jump onto the sink before leaving the room.
- Clear Levels 2-4 with notes open. These levels use timed levers, mirrored routes, museum sightlines, train-seat symbols, weighing puzzles, and two-player timing checks.
- Treat Levels 5-6 as method-first levels. The readable text references are incomplete in parts, but they identify several important doors, maze logic, and exact codes.
- Use the verified video playlist for visual confirmation when the text references become image-only. The ThaiGameGuide playlist was verified by YouTube oEmbed as “In Sink : All Levels Full Gameplay Guide & Walkthrough” by ThaiGameGuide.
- After clearing the game, return for Egg. Community notes place the Egg code clues across Worlds 1-8 and the final code room after the main clear.
What This Walkthrough Can Verify
The strongest readable reference is a Steam Community walkthrough with hints and achievement notes, but that page is marked by Steam as incompatible with In Sink and is unfinished after Level 6. Other Steam pages cover the two hidden achievements, a Level 1-9 video playlist, and Level 9 notes. ThaiGameGuide provides a readable hub with level-by-level video links from Level 1 through Level 9 and hidden-achievement videos. Because of that source mix, this article uses two confidence levels:
| Coverage | Confidence | How To Use It |
|---|---|---|
| Levels 1-4 | Detailed text route plus exact code-style solutions where available. | Use the room notes directly. They are the most complete part of the reference set. |
| Levels 5-6 | Partial text route with some exact solutions. | Use the methods and confirmed codes, then check the embedded playlist when a room relies on screenshots. |
| Levels 7-9 | Cautious summary, video-backed route, and Level 9 puzzle outline. | Use the playlist for room-by-room visuals; use the written notes here as a checklist, not a full substitute for the level screen. |
| Hidden achievements | Good cross-check from multiple community references and Steam achievement data. | Do “In Sink” in Level 1, then do Egg after you have the world clues. |
Official Basics
Steam lists the game as In Sink: A Co-op Escape Adventure, developed by Clock Out Games and published by Kwalee. The release date on Steam is November 12, 2024. The official categories include multiplayer, co-op, online co-op, Steam achievements, full controller support, Steam Cloud, and Family Sharing. The listed genres are Adventure, Casual, Indie, Simulation, and Strategy.
The official description is important because it explains the puzzle language: In Sink uses shapes, signs, colors, and numbers rather than heavy written clues. Steam currently describes “eight engaging levels,” while the readable walkthrough/video references cover Level 1 through Level 9, and Steam’s global achievement API exposes completion flags through Level 10. If your build shows additional arcade or update content, treat this guide as the core escape-room route plus cleanup guide, and verify the final level count from your in-game level select.
Co-op Rules That Solve Most Rooms
Most failed attempts in In Sink come from describing the wrong thing. Before assuming a puzzle is random, slow down and identify each player’s role.
| Room Pattern | What One Player Usually Has | What The Other Player Usually Has | Safe Callout |
|---|---|---|---|
| Code exchange | Numbers, colors, symbols, or recipes. | A keypad, wheel, lever bank, or input panel. | “Top row, second symbol; color is red; number is 4.” |
| Mirrored rooms | A fixed clue that cannot be changed. | A matching object that can be changed. | “Mine is fixed. Yours should become this.” |
| Timed levers | A route through several switches. | A support lever, platform, or reset timing. | “Reset blue now. I am going to red next.” |
| Movement maps | One direction of movement or half the hazards. | The other direction or the other hazard map. | “You can move left two; I have a rock after that.” |
| Image-only symbols | A hard-to-name shape. | A panel full of similar shapes. | “It looks like a triangle with a tail on the lower right.” |
Level 1 Walkthrough
Level 1 is the tutorial, but it also contains the most important habit in the game: describe the clue, then describe the input. The first rooms teach platform timing, button timing, jumping a barrier, and flipping a lever. The first real code puzzle asks each player to inspect a square box, read the number visible on their side, and give that number to the partner’s matching keypad. The community text records the purple keypad as 334 and the mint keypad as 215.
The next tutorial room uses colored shapes viewed from below the open door. Each player reads the ordered colors/shapes from 1 to 4, then enters the sequence on the keypad. The referenced solution lists the adult route as Black, Yellow, Blue, Green and the child route as Green, Red, White, Yellow. If those colors do not match your current build, use the method rather than forcing the saved answer: stand under the door, read the numbered order, then input that order exactly.
Bar With Karaoke
The bar has two puzzles. First, one player reads plates that tell whether color-coded levers should be up or down, while the other counts bottles by color and maps those bottle counts to lever numbers. The recorded lever sequence is: 1 up, 2 up, 3 up, 4 down, 5 up, 6 down, 7 down, 8 up, 9 down. The key is not memorizing the list; it is understanding that arrow direction gives the lever state and bottle counts decide the lever number.
The drink puzzle is a recipe-reading exercise. One player reports the glass color and ice count. The other finds the matching recipe card and calls out the four color/symbol settings. The maker inputs those settings and tells the partner when to press the button. Four correct drinks clear the room.
Kitchen And Hidden “In Sink” Achievement
The kitchen has the hidden achievement named In Sink. Before you leave, jump onto the sink. Multiple references agree that this is the unlock condition.
For the first kitchen puzzle, match colored objects and numbers to lever positions. The referenced solution is:
| Lever | Position |
|---|---|
| 1 | Left |
| 2 | Right |
| 3 | Middle |
| 4 | Right |
| 5 | Middle |
| 6 | Left |
| 7 | Left |
| 8 | Middle |
The second kitchen puzzle uses a scale/platform split. One player steps on the scale, the other uses the new platform, and both compare the visible numbers and symbols. The referenced keypad solution is 2679, paired with the symbol order triangle, heart, star, rhombus.
Dressing Room
The dressing room is a mannequin/clothing-symbol puzzle. The important trap is that the mannequins are not necessarily arranged in simple numeric order. Read the numbered panels with red X marks first, identify which clothing piece each panel asks for, then take the matching symbol from the correct mannequin. A hint in the reference points to black pants from the first mannequin as one of the code pieces. Because the actual symbols are visual, use row/slot descriptions rather than trying to invent names for them.
Ship
The ship room has three puzzles. First, collect the color-number clues around and outside the ship, then apply the formula shown on the ship. The community solution summarizes the dial as 4627. If your team wants to solve it cleanly, write the blue, red, and yellow rows down before entering anything.
The second puzzle asks one player to describe a symbol on a screen while the other chooses it from a set of very similar symbols. Six correct symbols in a row are required. Do not rush this one: agree on top/bottom marks, tails, gaps, and rotation before confirming.
The final ship puzzle is a shared boat map. One player controls up/down movement and the other controls left/right movement, while each sees different rocks. Both rock maps matter. Move in short calls: “I can go up two,” “stop before the third left,” “your map is clear but mine is blocked.” After the final red button, the Level 1 completion achievement unlocks.
Level 2 Walkthrough
Level 2 is the hotel level. It tests timing, hidden switches, mirrored routing, and a few puzzles that are easier with written notes.
Hotel Foyer
The foyer asks you to keep multiple levers active at once. Some levers are timed, some change the room, and three are hidden. The important hidden spots are a wall panel lever, a lever behind the reception desk, and a fountain lever. A safe strategy is to assign one player as the runner and the other as the reception/platform helper, then reset timed levers before they expire instead of trying to sprint the whole room blind.
Back Alley
The alley has two trash-bin code puzzles. For the four-number code, count the visible bottles, trash, boxes, and vases in the order shown by the wall symbols. The referenced solution is 3655. For the six-number code, match the strange symbols to number cards on the tables. The referenced solution is 234435.
Cafe And Sewer Transition
In the cafe, flip cups and use the table symbols to map the blue-button order. The referenced order is 14235, with the warning that mirrored input may matter. In the transition zone, use the arrow panel to move the magnet over the sewer gate, activate the magnet, lift the gate, then move it away so both players can drop down. The child route includes a crawlspace and a platform that opens the adult route.
Labyrinths
The labyrinth room has two role-swapped puzzles. One player moves large map sections while the other physically walks through them. The trick is that the red and blue map parts do not simply align into one obvious exit. You often need to place the walker on a dead-end/intersection tile, move the map section, then let the new alignment create a path. The walker should report color and nearby symbol, not just “I am here.”
Launderette
Before chasing the symbols, make the shower work by fixing the pipes, then have both players take a shower so the codes appear. The puzzle uses a navigation panel and a symbol panel. Start from the marked north-star position, move according to each digit of the shown code, and stay on the new symbol after every move. Do not reset to the start after each digit. The available reference relies heavily on images here, so the method is more reliable than any text-only symbol description.
Office And Hotel Rooms
The office is a bookshelf comparison puzzle. Each player should describe bookshelf color, row number, and book position. The referenced flips are:
| Side | Bookshelf | Rows To Flip |
|---|---|---|
| Child | Blue | Row 1 book 2; row 2 book 1; row 3 book 3. |
| Adult | Red | Row 1 book 1; row 2 books 2 and 3; row 3 nothing. |
| Adult | White | Row 1 nothing; row 2 books 1 and 2; row 3 book 3. |
The final hotel-room set has five puzzles in the main reference, but several sections were still marked as writing in progress. The verified pattern is that one player has fixed statue/symbol information while the other can change matching symbols, then later puzzles use digits, vases, hall pictures, and building/floor logic. Treat this section as a communication test: identify what cannot change, match it on the other side, and call symbols by picture plus row/floor position.
Level 3 Walkthrough
Level 3 starts outside and moves into a multi-section museum. It is less about speed and more about sightlines, windows, color doors, and using one room to read another.
In the parking lot, find the hidden numbers and note their shapes. The referenced security booth code is 246. Inside the security booth, one player sees a projected symbol and the other steps on the matching floor symbol, then reports the code that appears. Repeat for three symbols.
In Museum Section 1, press buttons in the correct order by using the view out the window. The memory-block rooms ask each side to shift colored blocks to match the placement visible in the partner room. For the corridor and painting gallery, remember that eye buttons can open color doors when viewed through glass; sometimes you need to look through the door rather than stand directly next to the switch.
In Museum Section 2, both players solve line-connection electricity panels. Then, in the single-color painting room, the red painting route requires walking backward to find the exit path. The floor-button room splits required symbols between the players, so each row must be compared before anyone starts jumping on buttons. The map/ball puzzle uses color activations as walls; complete it once, then repeat with roles reversed.
Museum Section 3 is the H-map area. Use the map arrows to open side rooms, inspect the clock rooms, and use window views to set the orange room’s low/medium/high panel. The referenced combined door code is 732566. In the barrel room, match colored barrels to symbols from the vases. For the 2×2 square panels, activate the red H-map button and read the ceiling pattern, paying attention to arrow direction. The pool wiring room is a memory match between lever symbols and button symbols. The switch-room sequence recorded in the text reference is 4, 3, 4, 1. When the largest lever is too big to flip normally, return to the H-map and look for the alternate interaction.
Level 4 Walkthrough
Level 4 is the train level. The text reference is still fairly useful here, especially for the luggage scale, restaurant, planter boxes, and timing puzzle.
In the luggage room, the target weight is 34. The referenced weights are adult 8, child 6, white block 22, yellow 13, green 7, orange 11, blue 2, and red 6. Two recorded solutions are blue + yellow + orange + adult and white + red + child.
For the ticket machines, match each yellow ticket’s cut shape to the machine with the same shape, then communicate the ticket’s symbol order to the partner because the machine you need may be in the other compartment. Be careful: some machines display symbol order as 2-3-1 rather than 1-2-3.
In the seating compartments, wait for the tunnel to reveal symbols on seats. Each poster’s green X marks indicate the seat your partner should inspect, not necessarily your own. Use row/column language for the 4-by-4 input panel, such as “row 1 press buttons 1 and 2.”
The train restaurant uses symbol panels, fridges, and dining tables. Press a metal-box symbol to open your partner’s fridge, have them describe the food items, find the matching table number, then guide the partner to the correct symbol slider and code panel. The referenced codes are 38, 47, 36 for the child character side and 71, 94, 12 for the adult character side.
In the planter-box puzzle, each symbol becomes a number by growing the matching plant under the correct weather and temperature conditions. Use the poster to set weather and temperature, count the plants that grow, then solve the equations. The referenced codes are 265 for one side and 548 for the other.
The pool wall is a rotating-line image puzzle. Once both players complete the wave-like image, a symbol code appears. Press button numbers in the order represented by the symbol code; if a button makes a symbol appear behind the partner’s window, that button’s number belongs to that symbol.
The electrical-current puzzle is a timing test. One player watches the current and capsule colors, while the other presses the required color button just as the current reaches the capsule. Let the current pass through ten times, then repeat with roles reversed. In the operator’s cabin, adjust train speed to read the symbols on the side of the passing trains. Red-train symbols go to the red panel; blue-train symbols go to the blue panel.
Levels 5 And 6
The main text walkthrough becomes incomplete at Level 5, so use this section as a supported checklist rather than a full code dump. The ThaiGameGuide video playlist embedded below is the better verification path when a room depends on screenshots.
For Level 5, the obvious door does not open; turn back and use the upstairs entrance. The brain-door maze uses directions shown in the starting room, with missing-arrow rooms requiring environmental clues. The final maze-room hint is to think like the entrance: when the obvious way forward fails, go back through the door you came from. The community note for the lava-arrows maze is also “go back” when you are stuck in a loop. The same reference reports that the hazardous pit room could be crossed by running through it, but treat that as build-dependent behavior rather than a guaranteed intended solution.
For Level 6, the Hollywood Road door code is recorded as 5264. The logic is to identify the four-symbol building name, find the matching symbols in the construction area, use their surrounding shapes to choose the correct pressure plates, then read the number values from the palm pedestals. In the wooden winter cabin, use the north/east/west/south arrows and the upstairs poster to order the four symbols for the toolbox-style code. The TV pattern upstairs must be copied to a 4-by-6 block panel. A later timing puzzle asks one player to press a red button when a fast-moving small square reaches a marked rectangle on the TV schematic; three correct timing hits produce the sound cue. Finally, read the sideways TV settings by using the arrows to decide which side is up, then copy those settings to the slider panel.
Levels 7, 8, And 9
The provided text references do not contain a complete written Level 7 or Level 8 solution. ThaiGameGuide lists full gameplay walkthrough videos for Level 7, Level 8 plus ending, and Level 9, and the Steam guide by Gametoon points to the same level playlist. Use the embedded playlist here if you need room-by-room visual confirmation.
Level 9 has a short readable guide, but many of its solutions are image-based. The useful text outline is:
| Level 9 Puzzle | What To Look For | Practical Advice |
|---|---|---|
| Puzzle 1 | Two four-digit numbers. | Have each player read one complete number aloud, then confirm digit positions before entering. |
| Puzzle 2 | Rows on the keypad correspond to numbered stands. | Choose the correct statue by matching the plate shape, then use the stand number as the row guide. |
| Puzzle 3 | Object room. | Catalog objects by position and symbol. The source text is too thin for a reliable fixed answer. |
| Puzzle 4 | Four arrow moves. | Say the arrow sequence once, repeat it back, then move. This is a communication puzzle more than a speed puzzle. |
| Puzzle 5 | Cave section. | Use the playlist for visual routing; the written source only identifies the section. |
| Puzzle 6 | Ten blocks. | Place blocks in a numbered order and check the final arrangement visually before confirming. |
| Puzzle 7 | Painting and six symbols. | Use symbol-by-symbol descriptions. Community comments warn that one triangle-like symbol is easy to mix up for Egg cleanup. |
| Puzzle 8 | Music/drum combination. | Each side has four drums; three are buttons and one is triggered by jumping. Count beats aloud. |
Hidden Achievements
Steam appdetails lists 12 total achievements, and the global achievement API confirms level-completion achievements plus the hidden achievements In Sink and Egg. The public Steam achievement page was readable but mostly shell text in this capture; the API was the cleaner verification source for the achievement count and internal names.
| Achievement | How To Unlock | Notes |
|---|---|---|
| LVL 1 through LVL 8 | Finish the corresponding level. | Steam appdetails highlights these level achievements. |
| Later level completions | Finish the additional levels shown in your current build. | Steam’s global achievement API includes BEAT_LEVEL_9 and BEAT_LEVEL_10, while the store text still says eight levels. |
| In Sink | In Level 1’s kitchen, jump onto the sink. | Do it before leaving the kitchen. It is easy and missable within a normal first pass. |
| Egg | Find the world clues, then use the code room after the main clear. | Community notes place clues in Worlds 1-8 and warn that the World 7 triangle-like symbol is easy to misread. |
Egg Clue Locations
The Egg guide gives clue locations rather than a clean text code. Use this as your cleanup checklist:
| World | Reported Clue Location |
|---|---|
| World 1 | The first room after the pressure plates. |
| World 2 | The shower room. |
| World 3 | The painting room, through the green painting. |
| World 4 | Reported on the red train car. |
| World 5 | On one of the planter boxes in the first room. |
| World 6 | On the back of a golf cart. |
| World 7 | In the library, under one of the staircases. |
| World 8 | Under the stairs near the end of the game. |
| Code room | Use the collected clues after clearing the game or after reaching the final access point in your build. |
One Steam comment says the code room may not strictly require beating the full game first, while another says the last clue effectively expects a second playthrough or level reload. The safest cleanup route is: finish the game, reload the needed levels for missed clues, then enter the Egg room with every clue written down.
Common Mistakes
- Describing a symbol with only one word. “Triangle” is not enough when there are several triangle-like symbols. Add orientation, cutouts, tails, and position.
- Forgetting that the partner’s clue may be for your input. In several rooms, your poster, ticket, or seat map tells the other player what to do.
- Resetting navigation puzzles to the start after each step. In the launderette-style movement puzzle, you stay on the symbol you reached, then move again from there.
- Trying timed levers without roles. Assign a runner and a reset/support player before starting the timer loop.
- Entering image-based solutions from memory. If a community solution was shown as a screenshot, compare the actual image or video instead of relying on a vague symbol name.
- Leaving hidden achievements until too late in the room. Jump onto the Level 1 kitchen sink as soon as you reach it, then continue the puzzle normally.
Final Cleanup Checklist
- Finish every level visible in your current level select.
- Confirm that the standard level-completion achievements unlocked.
- Replay Level 1’s kitchen and jump onto the sink if you missed the In Sink hidden achievement.
- Collect the Egg clues from Worlds 1-8, paying special attention to the World 7 triangle-like symbol.
- Use the code room after the main clear or after the final clue is available in your build.
- For image-only puzzles, use the embedded ThaiGameGuide playlist rather than guessing a symbol from text.
Sources And Credits
Official metadata and screenshots are from the Steam store page and Steam appdetails for In Sink: A Co-op Escape Adventure. The official website listed by Steam is insinkgame.com. Puzzle routing was cross-checked against readable community walkthrough references and the verified ThaiGameGuide YouTube playlist embedded above.