Part 6: Simon — 100% Walkthrough

Last updated: 2026-09-22 · 12 min read

Part 6 covers Chapters 14 to 17 and contains the two save points that determine how many times you have to play this game. It also contains the Sci-fi ending's keypad, which ends the story early and skips the final boss entirely — useful if you know it is there, and confusing if you trigger it by accident. Save before the sequences described below.

CEG HQ

You regain control of Simon on the tenth floor. The opening here is dense with documents, so sweep before moving on:

The Reference Sheet matters more than it looks. It supplies both codes for the alarm panel puzzle below, and it is easy to walk past because it is simply on a desk in the middle of a room you are crossing.

Puzzle: The Alarm Panel and Tower Rotation

Go back to ground level and interact with the alarm panel beside the red clamp wheel. This is a multi-stage puzzle and the order is not optional.

Stage 1: Unlock the panel

1. Interact with the keyhole and use the Controller Key to unlock the buttons.
2. Enter A5D7 — the Alarm Code from the Reference Sheet — and hit OK.
3. Interact with the panel on the right side and enter E3E3 (from the top of the Reference Sheet) and hit OK.

Stage 2: Route the pipe, floor by floor

Now you need to use the crank on each floor to rotate the middle tower so the red pipe runs all the way to the top. Work through the floors in order:

Stage 3: Ignite

Return to ground level and interact with the right side panel. Press in this order: Gas Flow, then Flow Test (all lights should go green), then IGNITE.

There is a second CRTV Channel ~42 once you exit the pipes: when you drop out and are crouching through, look on the left instead of going to the ladder, and interact with the radio. Classic missable — it is off the critical path.

FIG. 01 — CEG HQ holds two separate CRTV signals at the same frequency. The second one is off the main route.

FIG. 02 — CEG HQ is the last area with a dense document sweep before the ending is calculated.

SWDP and the Clamp Release

SWDP is the final area and it is where the remaining collectibles concentrate. Sweep it properly — this is your last chance to add to the Discoveries count before the ending is calculated.

The progression here runs through the ROC and Clamp Release puzzles. Completing the ROC and Clamp Release steps has a useful side effect: it despawns the enemies in the area. If you are trying to finish with a low kill count, that is worth doing before you go exploring rather than after.

Two additional notes for this section:

• When you reach the step where you need to unlock the door to the valve using the panel, you can also unlock door 793 in the lower area. That room contains the Gold Coin, which is a New Game Plus item for the Dog ending.
• At the same step, unlock door 621. Inside is Strange Book #3, one of the three books for the Sci-fi ending.

Both of those doors are easy to leave locked because nothing forces you to open them. If you are running New Game Plus, open both.

The Final Save Points

At this point you should hold two manual saves:

Branching the Endings

From Save B, the three outcomes split as follows. Full detail, including the ending names and trophies, is on the endings page — this is the practical order to do them in.

1. Reload Save B and take the Sci-fi ending first. Head down the ladder to the exit door and use the Strange Keycard on the panel on the left wall. The ending triggers immediately once the door opens, and it skips the final boss — which is why it is worth doing before the others rather than after.
2. Reload Save B again and take the Dog ending. After the ladder, head down the red hallway and give the Gold Coin to the Guide Dog at the door, then complete the boss fight. The Dog ending plays in the final cutscene.
3. Reload Save B a third time and take Justice. Do not give the Guide Dog a coin and do not use the card reader at the exit door. Go through as normal and defeat the final boss. With a high Discoveries count and a low kill count, you get Justice.

For Forever and Abandoned, reload Save A from Part 4 instead. At that point, count your total Clues and Documents, then:

• Reload Save A and start killing every enemy you see from there to the final boss. If you pass roughly 60 kills, you get Abandoned even with 80+ Discoveries.
• Reload Save A and aim to have only a small lead in Discoveries over kills at the final boss — kill some enemies but keep Discoveries ahead — and the final cutscene gives you Forever. If you land Abandoned again, reload and collect a couple more documents in the area while avoiding kills during the final boss.

FIG. 03 — New Game Plus resets weapons and documents, but keeps cumulative trophy progress.

New Game Plus

New Game Plus is required for two of the five endings, so a minimum of two full playthroughs is unavoidable. A few things worth knowing before you start it:

• NG+ does not carry anything gameplay-wise. You re-collect all weapons from scratch, including the axe and any firearms.
• What it does add is access to the two NG+ exclusive endings, plus the Axe and the Pistol-3000. The Pistol-3000 is only obtainable after you have completed the Sci-fi ending once — look in the row of houses with "For Sale" signs along the railing, the same place you picked up the Axe.
• Strange Postcards do not reappear in NG+. If you collected them on run one, they stay collected and are absent from the world. This is the one collectible category that behaves this way.
• Clues and Documents reset and must be re-collected, because they are what the ending calculation reads on each run.
• Cumulative trophies carry over, so combat, stealth, distraction, phone-call and CRTV-signal progress all persist.

Part 6 Trophies

Note the interaction between Eraser and the Sci-fi route: because Sci-fi skips the final boss, taking that ending does not award the boss trophy. That is precisely why the recommended order takes Sci-fi first and then reloads — the other branches still fight the boss.

Part 6 Checklist

Manual save at the red crank, Chapter 15 · doors 621 and 793 unlocked on the NG+ run

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