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Basement

Blue Prince: Full Basement Map and Underground Walkthrough

A full-spoiler Blue Prince guide to the Basement Key, Underground map, pallet-jack bridge puzzle and route through the Underground to Room 46.

By VGSources Team 2 min read

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Spoilers: This guide covers the Basement, its map and pallet-jack puzzle, and the route through the Underground to Room 46. Find the Basement Key in the Antechamber, enter the Basement through the lowered Foundation elevator, then use the Basement’s full Underground map and solve the pallet-jack bridge puzzle to continue.

Get the Basement Key in the Antechamber

Reach the Antechamber and enter through any accessible door. A pedestal rises in the center of the room with the Basement Key. The note beside it reads: “To continue up, you must go down.”

The key opens the locked Basement entrance at the bottom of the Foundation elevator. It can also open the entrance at the bottom of the drained Fountain.

Enter the Basement

Use the Foundation elevator

The Foundation is the most reliable documented entrance to the Basement. Draft it, then draft an adjacent room with the doorway needed to access the Foundation’s back wall. Operate the elevator mechanism, ride down, and unlock the door with the Basement Key.

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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.

Other entrances

The drained Fountain, Tomb, Precipice and Cliffside can also provide alternate routes into the Underground, but each has different requirements. The Foundation route is the clearest option when you want a direct, documented way to reach the Basement.

Find the full Underground map

Inspect the desk in the Basement to find a complete map of the Underground. A second full copy is in the Rotating Gear Room; map fragments found elsewhere match sections of the same layout. Look closely at the map for a marking of the number 10 associated with the Basement route.

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

Solve the Basement pallet-jack puzzle

The pallet jacks serve as movable bridges over gaps between crates. You need to arrange them in the available lanes, cross the crates and reach the wall button.

  • You can push or pull the pallet jacks, but they cannot turn.
  • They cannot pass through one another.
  • Each jack can only be moved from sides that the room’s layout allows you to reach.
  • Use the lanes to reposition the jacks into bridges over the crate gaps, then cross to the button.

These constraints explain the objective and how the jacks behave, but they do not establish a complete move-by-move sequence. The exact order depends on the current arrangement, so use the visible lanes and accessible sides to plan each repositioning rather than relying on an unverified sequence.

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Rank #3
Blue Prince - P5
  • Brand new. UK Import PAL version. Game in English. UK PSN account may be required for any online features.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Support on Ko-Fi

Open the route through the Underground

Move the Reservoir minecart

From the south side of the Reservoir, move the minecart. This permanent change opens access between the Reservoir and the Rotating Gear area.

Cross the Rotating Gear area

Use the control panels in the Rotating Gear room to align the gear spokes. Cross the aligned gears to reach the Underpass, then continue to the Inner Sanctum.

Rank #4
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Handheld Game Console Built-in 400 Retro Games, Travel-Friendly Gaming Console with Long Battery Life, Plug and Play Video Game Console for Kid Adult (Blue)
  • [ Kids Handheld Game Console Built-in 400 Retro Games ] - This handheld gaming console is pre-installed 400 nostalgic games such as arcade retro games, puzzles, arcades, shooting, racing, fighting and adventure games. Kids are able to cultivate skills such as hand-eye coordination, thinking, and problem-solving while playing these games.
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  • [ Rechargeable and Long Battery Life ] - This video game console is equipped with a 500mAh lithium - ion battery, which supports up to 5 hours of continuous play. And 1-2 hours for fully charged. There is no need for frequent battery replacement. Remember to charge it when you receive the package.
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Pull the Inner Sanctum lever

Pull the lever in the center of the Inner Sanctum. It unlocks the Antechamber’s north door.

Reach Room 46

Return to the Antechamber and go through the north door, marked with a crescent moon symbol. With the Inner Sanctum lever pulled, the door is open and leads to Room 46.

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Quick Recap

Bestseller No. 2
Blue Prince - PS5
Blue Prince - PS5
The physical edition will include a fold-out poster of the magnificent Mt. Holly Manor
$44.80
Bestseller No. 3

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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