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How to Reach the Antechamber and Room 46 in Blue Prince

The Antechamber sits at Rank 9, but its doors must be opened elsewhere. Compare three entry routes and follow the guide’s path through the Underground to Room 46.
WorldBlue Prince Length3 min Posted Quest giverVGSources Team
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The Antechamber is fixed at Rank 9, but its doors start sealed. To enter, first open one of them from elsewhere in the estate; then draft a room beside the Antechamber to connect to it. The routes below are alternatives, not steps in one guaranteed sequence. Spoilers: the later sections explain the Basement Key, Underground route, and how to reach Room 46.

Where to find the Antechamber

The Antechamber appears at the center of Rank 9 on the blueprint. Unlike an ordinary room, you do not normally draft it directly: draft a room adjacent to it to make a connection. Its doors begin sealed, so you must activate an entry lever elsewhere in the estate first. The Blue Prince Wiki’s Antechamber page describes the room’s position and mechanics.

Choose an entry route

A walkthrough updated in November 2025 describes three ways to open an Antechamber entrance: through the Secret Garden, Great Hall, or Greenhouse. These are guide-reported options, not routes independently tested here; which one is practical depends on what you draft and what items you have. TheGamer’s walkthrough provides the route details.

Route What the guide says you need What to weigh
West door: Secret Garden Secret Garden Key, access through an outward-facing locked door, and the garden’s wind-vane mechanism. Requires the key and solving the mechanism to reveal the lever.
East door: Great Hall Access to the Great Hall’s locked side door, using keys, a Lockpick, or access through the Foyer. The guide describes several ways to handle the locked doors; the route may require more resources or an alternate unlock.
South door: Greenhouse The Greenhouse and a Broken Lever to repair the mechanism. Depends on finding the required item and reaching the room.

West route: Secret Garden

  1. Obtain the Secret Garden Key and reach the outward-facing locked door that leads to the Secret Garden.
  2. In the garden, solve the wind-vane mechanism to reveal the lever.
  3. Pull the lever to open the west Antechamber door.

East route: Great Hall

  1. Reach the Great Hall and get access through one of its locked side doors.
  2. Use a key, a Lockpick, or the Foyer route, as available, to reach the hidden lever.
  3. Pull the lever to open the east Antechamber door.

South route: Greenhouse

  1. Reach the Greenhouse and obtain a Broken Lever.
  2. Repair the mechanism and activate it to open the south Antechamber door.

Enter the Antechamber and find the Basement Key

Once an entry door is open, draft an adjacent room at Rank 9 to connect into the Antechamber. On the first visit, the guide reports that a central pedestal holds the Basement Key. A note beside it reads: “To continue up, you must go down.” That clue points toward the Underground as the next part of the route.

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#1 Best Overall
Blue Prince Day One Edition - PlayStation 5
  • DRAFTING YOUR JOURNEY - Upon reaching a closed door in Mt. Holly, you decide what room appears behind it and each decision shapes your path as you navigate through the manor. Every door can reveal new and exciting chambers that contain their own unique challenges and secrets. But be careful how you draft, for each day the manor’s floor plan resets and the rooms you saw today may not be the same rooms you see tomorrow.
  • EVERY STEP COUNTS - Your progress each day is shaped by the rooms you select to draft and the tools you find within them. Items in the game can be used in a number of creative ways to fuel your exploration deeper into the house, allowing you to adopt unique strategies to combat the challenges that each day brings.
  • A HISTORY IN THE MAKING - As the heir of Mt. Holly, you have been tasked to explore its shifting halls in search of Room 46. Yet as your journey takes you further into the mansion’s depths, you start to discover that there is more lurking under the surface than a missing room. Investigate a past woven with the threads of blackmail, political intrigue, and the mysterious disappearance of a local children’s book author.
  • DAY ONE EDITION BONUSES - Pack-in bonuses include 18” x 12” fold-out poster of the magnificent Mt. Holly Manor and a download code for the official game soundtrack.

Reach the Underground

The walkthrough lists several Underground entrances: Foundation, Fountain, Tomb, Precipice, and Cliffside. It recommends the Foundation route, but that is the guide’s preference rather than a universally best option; access depends on which rooms and connections are available in your run.

  • Foundation: the walkthrough’s recommended route.
  • Fountain, Tomb, Precipice, and Cliffside: other routes listed by the guide.

The route description does not establish a comparative success rate or guarantee that any one entrance will be available. Use the one your estate layout and unlocked rooms allow.

Rank #2
Blue Prince - PS5
  • The physical edition will include a fold-out poster of the magnificent Mt. Holly Manor
  • Additionally, all pre-orders will include a download code for the official game soundtrack. This code will be included on a voucher inside the game pack for all D1 orders
  • DRAFTING YOUR JOURNEY - Upon reaching a closed door in Mt. Holly, you decide what room appears behind it and each decision shapes your path as you navigate through the manor. Every door can reveal new and exciting chambers that contain their own unique challenges and secrets
  • EVERY STEP COUNTS - Your progress each day is shaped by the rooms you select to draft and the tools you find within them. Items in the game can be used in a number of creative ways to fuel your exploration deeper into the house, allowing you to adopt unique strategies to combat the challenges that each day brings
  • A HISTORY IN THE MAKING - As the heir of Mt. Holly, you have been tasked to explore its shifting halls in search of Room 46. Yet as your journey takes you further into the mansion’s depths, you start to discover that there is more lurking under the surface than a missing room

Open the north door and reach Room 46

The guide’s route continues through the rotating-gear area to the Inner Sanctum. There, pull the north lever to open the Antechamber’s north door. Return to the Antechamber; the north door provides the path to Room 46. This sequence is the walkthrough’s reported route, not a first-hand tested result.

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What resets between runs

Room-door and lever states in the Antechamber reset each day, according to the third-party wiki. The walkthrough says the north door remains open after its lever is pulled. Treat these as different state claims: the entry setup may need to be repeated on another day, while the guide reports the north-door unlock persists. Neither source is official patch documentation, so this persistence detail should be treated as guide-reported rather than a universal guarantee.

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