07A Chapter seven · Part one
Overgrown: Pressure Pipes
Repair the greenhouse pressure system by connecting the pipe network without leaving a leak or sending flow to the wrong coloured container.
FULL Chapter walkthrough
Complete puzzle guide
Overgrown begins with a gas-pipe puzzle across two rooms. The explorers must mix three target colors and send each gas to its matching tank without a single leak.
Gas sources, tanks, and shared pipes
Pipes with the same number are connected across the two rooms. The first room contains yellow and blue gas switches plus the purple, orange, and green storage tanks. The second room contains the red gas switch.
Only the pipe pieces are needed for this stage. The other equipment and notes in the second room belong to later puzzles. Use the crouch control to enter the low arched opening.
- Red + blue = purple
- Red + yellow = orange
- Blue + yellow = green
Collect the loose pipe pieces
- Room 1 has four pieces: one straight, one T-junction, and two elbows. They are beside the purple tank, beside numbered pipe 2, and on the left and right sides of the shelf.
- Room 2 has four pieces: one straight, one T-junction, one elbow, and one cross. They are on two plant roots, beside the low arched entrance, and on the table holding the mixing notes.
- Each room uses three of its four available pieces for a completed gas route.
Connect every route without leaks
Gas fills every connected branch, even if that branch ends blindly or splits away from the target. Connecting to a numbered pipe also sends the gas into the matching numbered pipe in the other room.
Choose the straight, elbow, T, and cross pieces so every live branch terminates correctly. A hidden open end still counts as a leak.
Use the pressure gauge to verify the network. The needle at the far right means there are no leaks; movement to the left indicates the number of leaking points. The puzzle will not complete unless the required gas reaches its matching tank and both rooms are leak-free.
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Exact pipe layouts
All directions above are read while facing each three-slot pipe board, from its left slot to its right slot. Either listed Orange layout is valid.
- Purple — switch Red and Blue ON and Yellow OFF. Red-lever room, left to right: T open left/right/up; elbow open left/up; straight horizontal. Two-lever room: straight horizontal; elbow open left/down; elbow open right/down.
- Orange, layout A — switch Red and Yellow ON and Blue OFF. Red-lever room: elbow open left/down; empty; straight horizontal. Two-lever room: empty; empty; straight horizontal.
- Orange, layout B — switch Red and Yellow ON and Blue OFF. Red-lever room: cross; elbow open left/down; straight horizontal. Two-lever room: empty; straight vertical; T open left/right/down.
- Green — switch Yellow and Blue ON and Red OFF. Red-lever room: T open up/down/right; elbow open left/up; straight horizontal. Two-lever room: straight horizontal; elbow open left/down; T open left/right/down.
- After each color reaches its tank, confirm that the gauge needle is fully right before changing the network for the next color.