1666: Amsterdam Prologue Guide — Walkthrough & Length

The Prologue is a separate demo build with no combat: nothing carries into Early Access, and the investigation/Esbat loop only begins in the paid game.

Before you start

• Save slot. New Game prompts you to create a save slot — do it, then move forward.
• Controller recommended. The demo lists full controller support; the steps below use DualSense prompts (R1 / Square / L2 / R2 / X). PC keyboard bindings are not published.
• Hardware check. The demo requires hardware ray tracing and 8 GB VRAM, same as the full game. Crash troubleshooting is at the bottom of this page.
• Energy naming. Official text calls the energy Nux; one walkthrough renders it "Lux." Same resource, different spelling.

Act 1 — Noa's Commencement (1666)

1. Walk forward. You control Noa in the woods. Up ahead is a dead animal corpse — the game calls it a Life Echo. (The whispering and atmosphere are intentional.)
2. Gather Nux at the Life Echo. Press R1 to reveal Noa, then hold Square to gather energy.
3. Light the path. Hold L2 to concentrate, aim at any object with floating red leaves above it, hold R2 to enchant it, then press Square to ignite. A cutscene lights the torches on both sides of the path.
4. Reach the Sacred Tree. At the end of the path is a gathering around a leafless tree. The game's title card appears.
5. Ignite the braziers. Hold Square at the Life Echo to gather Nux again. Hold L2, aim at the brazier on the left, hold R2, then press Square to ignite all the braziers around the tree. Press Square when prompted to "enliven."
6. Analyze the tree. Hold L2 to aim at the tree, hold R2 to analyze, and learn about the cats in the branches.
7. Choose your companion. Pick a cat — see the list below.

Choose your companion (the cats)

The cats are called Bateratze — the game doesn't spell out what that means yet. Player reports say the chosen cat follows the protagonist and will matter to gameplay. In the Prologue itself, the choice has no gameplay difference; it only changes the name, flavor text and the closing scene.

Coverage mentions "ten-plus" options; the nine above are the documented ones. No walkthrough has found a difference between them inside the demo.

Act 2 — The Library (present day)

You now play Clio, daughter of Aaron Long-Smith, visiting Professor Lucas.

1. Talk to the Professor. Take the stairs up and speak to him.
2. Go to the fireplace desk. Go back downstairs to the desk by the fireplace and talk to the Professor again.
3. Find Section VI. The shelf section to your left, closest to the Professor's table, is Section VI — Ancient Writing Systems and Languages. Hold L2 to concentrate, aim at the roman numeral, hold R2 to analyze.
4. Take the book. Go to the shelf and look near the books. Hold Square when prompted, then press X to pick up the book with the next clue.
5. Return to the Professor. Talk to him to advance the cutscene.
6. Section XIV and Rembrandt. Take the stairs to the floor above. The section directly above the Professor's desk is Section XIV. Interact with Rembrandt's bust and take the note.
7. Deliver the note. Go back down and give it to the Professor.

Stuck here? The two easy misses are the Section VI shelf (left of the fireplace desk, downstairs) and Section XIV (upstairs, directly above the desk, on Rembrandt's bust).

Act 3 — New Year's Eve 1999

Flashback: you control Aaron with Agnes (Clio's mother) heading to their Amsterdam hotel room on New Year's Eve into 2000.

1. Follow the path. It's linear — floating text markers show you're on the right route to the elevator that leads to the room.
2. Gather the three relics. Hold Square and press X when prompted at each of these exact spots:
   • Dry Leaves — the shelf on your left.
   • Four Candles — the wooden chest straight ahead of the doorway.
   • Tapestry — the bag on the sofa to the right of the chest.
3. The transformation. After the cutscene you play as the cat. The path is linear; press X to jump up and down at prompted structures.
4. Through the red gate. It leads back to the Sacred Tree — time is paused at the moment you chose your cat. Analyze the tree and the red-hooded figure; you learn her name is Noa, The Collector.
5. Climb the branch. Go to the other side of the tree. Floating letters hover above a branch: go near it, press X to jump up, climb right, then go down the branch.
6. Finish. Press X near the bluish afterimage to complete the Prologue.

Ending and teaser

The Prologue ends right as the mystery lands: the cat you chose is Aaron, Clio's father, now bound as the witch's companion. A post-demo teaser shows the cat's traversal gameplay and action-oriented witch combat from the full game. Nothing from the demo carries into Early Access.

Controls quick reference (DualSense)

Prompts are also shown on screen during each scene, so the table is a fallback — not something you need to memorize.

Length and replay

Officially about 30 minutes; HowLongToBeat players average ~42 minutes for the main story. A second run to see another cat's closing scene takes only a few minutes once you know the path.

Stuck? Problems and fixes

• Can't gather energy. You must press R1 to reveal Noa first, then hold Square at the Life Echo.
• Nothing to enchant. Only objects with floating red leaves above them take the enchant — look for the leaves.
• Can't find a library section. Section VI is the shelf left of the fireplace desk (downstairs); Section XIV is upstairs directly above the desk, on Rembrandt's bust.
• Missing a relic in the hotel. Dry Leaves = left shelf · Four Candles = wooden chest ahead · Tapestry = bag on the sofa.
• Can't finish the cat climb. The floating letters mark the branch: jump up there, climb right, then go down the branch to the bluish afterimage.
• Crashing. Reported on borderline GPUs. Check your VRAM against the 8 GB ray-tracing floor first; there's no official fix list yet.
• Steam Deck? Not supported — the demo shares the full game's ray-tracing requirement. See the Steam Deck page.

Reception and known issues

• Steam rating: "Mixed" (~53% positive out of 1,000+ reviews at last check). Praise: atmosphere and the cat segment. Criticism: slow pacing, dated walking/interaction, no combat or payoff.
• AI assets: players flagged AI-generated images in the June build; the studio apologized. Coverage reports the full game will not use AI art.

Watch a full playthrough

• Bilibili — full playthrough with commentary (ZH): BV175E46WE4v ↗
• Bilibili — 23:44 PC demo playthrough: BV1szEs6tESr ↗

Prologue questions

Sources: Steam — free Prologue, Epic — Prologue page, HowLongToBeat — Prologue, TheSixthAxis — Prologue preview, Sirus Gaming — demo impressions, VGChartz community — full summary, NewsBreak/GameDaily — companion detail, ComicBook — three timelines, vgtimes — preview, GameMarkt — rating & AI controversy, Bilibili — full playthrough (ZH), Bilibili — PC demo playthrough (23:44). 1666: Amsterdam content and assets remain the property of Panache Digital Games.