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Before you start
Collect the reference sheet and the Controller Key before you touch any panel. Walkthroughs place the Controller Key in a box beside the valve on the second floor, so check that area first. You will need the reference sheet to translate the alarm code into the correct entry.
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Step 1: Release the controls with two codes
The puzzle uses two separate code entries. Do them in this order.
- Alarm panel: Use the Controller Key at the alarm panel. The panel displays alarm code 77289. Look up 77289 on the reference sheet, which gives the entry A5D7, and enter it.
- Command console: Go to the command console and enter E3E3, then confirm. This releases the rotation clamps on the pipe valves so you can turn them.
If the valves still will not turn, the clamp release has not registered. Re-check that you entered E3E3 at the command console rather than at the alarm panel.
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Step 2: Set each floor’s valve
Work from the bottom floor upward. Each valve has a fixed setting, and the goal is the same for every floor: the red pipe segment must meet the segment above and below it with no gap.
| Floor | Valve turn | What you should see |
|---|---|---|
| 1 | Two turns in either direction | Pipe enters the floor-1 section aligned for the floor-2 connection |
| 2 | One turn left (or three turns right) | The pipe bends to meet the floor-3 section |
| 3 | Two turns in either direction | Pipe continues upward to floor 4 |
| 4 | Two turns in either direction | Pipe reaches the top, completing the route |
On floors 1, 3, and 4, the turn direction does not change the final orientation, so you can turn either way. Floor 2 is the only valve where direction matters: a single turn left and three turns right land in the same position.
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Once all four valves are set, look at the pipe as a whole. It should appear as one continuous red line through all four levels. A visible break means at least one valve is off its setting.
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Step 3: Start the gas sequence at the ground floor
Return to the ground-floor console and work through the gas controls:
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- Select Gas Flow.
- Run Flow Test. It checks the aligned route.
- After the flow check succeeds, press Ignite.
Walkthroughs disagree on whether Gas Flow should be started before or after the valves are turned. The end results are the same: a successful Flow Test followed by Ignite. If your console shows a different prompt order from the one above, follow the on-screen prompts and check that the Flow Test passes before you ignite.
After ignition
Once the ignition succeeds, the walkthroughs direct you through the opening that appears on the left side of the area. Continue from there to move on through the chapter.
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If the puzzle does not work
- Valves will not turn: The clamps are still locked. Re-enter E3E3 at the command console and confirm.
- Alarm code does not match: Confirm the displayed alarm reads 77289 and that you are using the Controller Key at the alarm panel, not another panel.
- Pipe has a gap after turning: Recheck floors 1 to 4 against the table, paying closest attention to floor 2, where the direction changes the result.
- Flow Test fails: The pipe route is still incomplete. Return to the valves before running the test again.
Note that this guide is based on published walkthroughs for the game rather than official Konami documentation, so exact prompt wording may differ slightly between game versions and platforms.
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