Welcome to Blue Prince’s True Endgame
If you thought reaching Room 46 meant the mystery of Blue Prince was solved, think again. What you unlocked was not an ending—but an initiation.
Beyond the credits lies the Inner Sanctum, a dense, interconnected endgame puzzle chain that represents the deepest layer of Mt. Holly’s design. Here, everything you’ve learned about drafting, timing, symbols, Mora Jai logic, and environmental clues is put to the test.
This complete 2025 Inner Sanctum guide walks you step-by-step through:
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All eight Sanctum Keys and their correct, updated locations
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How to solve the Sigil puzzles tied to the Eight Realms
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The revamped Inner Sanctum Mora Jai Boxes
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Why Room 46 is actually the beginning—not the end
If you’re ready to move from heir to master, this is your roadmap.
🗝️ The Sanctum Keys – Updated Step-by-Step Quest Guide
There are eight Sanctum Keys, each tied directly to a line from a poem found in Room 46. While earlier guides listed partial locations, the quest only formally begins after your first completed visit to Room 46.
On a return visit, you’ll find a poem on the desk—this acts as a cryptic treasure map. Each line points to one key, and every location below reflects the latest community-confirmed findings.
All Eight Sanctum Keys (Confirmed Locations)
| Key # | Poem Line & Location | How to Obtain |
|---|---|---|
| 1 | “Found here on the furthest rank.” (Room 46) | Found on the desk in Room 46 on a return visit after claiming your inheritance. |
| 2 | “Locked tight in the vault of a bank.” (Vault) | Use Deposit Box Key #370 on its matching box. The key spawn is RNG-dependent. |
| 3 | “High up among all the clocks.” (Clock Tower) | Draft the Clock Tower and be inside it at exactly 1:30 PM in-game time. A secret room opens with a puzzle. |
| 4 | “Beneath all the docks.” (Reservoir – Drained) | Fully drain the Reservoir via the Pump Room. Find a black chest with a moon/flame symbol hidden behind a rock formation. |
| 5 | “Held by a king on his throne.” (Throne Room) | Unlock the Throne Room blueprint via the Blackbridge Grotto / Microchip puzzle. The key sits near the throne. |
| 6 | “Left in a station by one of your own.” (Safehouse) | Set Reservoir water to 6 units, take the boat to the Safehouse, and find the key on a crate inside. |
| 7 | “A major if you draft it quite late.” (Music Room) | Draft the Music Room late into a run (30+ minutes or near room limit). The key may appear on the left pillar. |
| 8 | “Behind the last door of eight.” (Mechanarium) | Draft the Mechanarium after placing 7 other mechanical/cog rooms. Unlock the diagonal door to find the key. |
⚠️ Critical Sanctum Rule
Once a Sanctum Key is used on an Inner Sanctum door:
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That door becomes permanently unlocked
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The key is consumed
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The key will never spawn again in future runs
This makes the Sanctum a long-term, run-spanning progression system.
🔮 The Sigil Puzzles – Understanding the Eight Realms
Each unlocked Sanctum door leads to a Sigil Puzzle, representing one of the Eight Realms—fictional nations with unique heraldry, symbolism, and lore.
These puzzles are more complex than they first appear and are not random.
How Sigil Dials Work
Every Sigil Puzzle uses four interactive dials:
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Top Dial – Controls inner shapes (motes)
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Second Dial – Controls dividing lines (rays)
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Third Dial – Alters quantity of motes and rays
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Bottom Dial – Changes outer border symbols
Where the Clues Are Hidden
Solutions are discovered through:
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Lore books like Realm and Rune
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Passport stamps in the Vault
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Classroom notes
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Environmental hints (such as the round altar in the drained Fountain)
✅ Complete Sigil Puzzle Solutions (All Eight Doors)
Doors are generally solved left to right inside the Inner Sanctum.
| Door | Nation | Inner Motes | Rays | Border |
|---|---|---|---|---|
| 1 | Orinda Aries | 5 Chips / Rectangles | 3 Byzantine Crosses | Small & Large Opaque Circles |
| 2 | Fenn Aries | 8 Double Triangles | 4 Byzantine Crosses | Wavy Lines |
| 3 | Arch Aries | 5 Square Boxes | Lightning Strikes | Spiky Triangles / Zigzag |
| 4 | Eraja | 5 Flowers | 3 Triple Rods | Horizontal & Vertical Lines |
| 5 | Corarica | 8 Triple Vertical Lines | 4 Skewers / Dotted Lines | Alternating Reversed Triangles |
| 6 | Mora Jai | 8 Control Pads (“Peas”) | 8 Straight Lines | Hollow Circles |
| 7 | Verra | 8 Nordic Sun Wheels | 5 Curved Wavy Lines | Tire Treads / Merlons |
| 8 | Nuance | 4 Double Triangles (Bottom) | 5 Smooth Curves (Top) | Shaded Boxes / Dashed Fill |
🏆 Reward
Solving all eight grants:
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Trophy of the Sigils
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Unlocks lore for Eight Realms in Eight Months, the next major endgame puzzle chain
🧩 Inner Sanctum Mora Jai Boxes (Major Update)
Earlier Mora Jai box guides no longer apply here.
What’s Changed
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Each Sanctum room contains a nation-specific Mora Jai Box
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You must align the flag color of that nation into all four corners
New Tile Behaviors
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Green tiles swap with their mirrored opposite
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Pink tiles rotate adjacent tiles
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Orange tiles shift to match the surrounding majority color
These puzzles require planning—not trial and error.
🎁 Reward
Each solved box grants an Allowance Token, permanently increasing your starting gold—essential for sustaining late-game runs.
🚪 Room 46 – Why This Isn’t the Ending
Room 46 is often misunderstood.
First Visit
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Triggered by pulling the North Lever in the Underground
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Credits roll
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You “claim your inheritance”
Return Visit (The Real Beginning)
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Room 46 changes
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The poem appears
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Sanctum Keys become accessible
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Inner Sanctum progression unlocks
Room 46 is not a finale—it’s the doorway into Blue Prince’s deepest layer.
🔑 Final Thoughts: Becoming Master of Mt. Holly
The Inner Sanctum represents the culmination of Blue Prince’s design philosophy: long-term progression, environmental storytelling, and layered logic that spans multiple runs.
By mastering:
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The Sanctum Keys
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The Sigil Puzzles
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The advanced Mora Jai mechanics
…you move beyond inheritance and into authorship of the estate itself.
💡 For visual help, check this helpful Steam Community thread where users are posting image breakdowns.
🔥 Community tip: Use paper or a screenshot to plan your moves before touching the board. Reddit users recommend this thread: Late Game Puzzle Help – Mora Jai Box
💬 Community Support
Still stuck? Join the conversation and find help here:
- Vault Room – Solve the rotating statue puzzle. (Vault Room guide)
- Clock Tower – Time-based puzzle tied to bell chimes. (Clock Tower guide)
- Reservoir – Requires adjusting water flow (see Reservoir guide).
- Throne Room – Hidden lever beneath the throne. (Throne Room guide)
- Breaker Box Room – Solve the VAC sequence (Breaker Box Room guide).
- Chess Room – Requires decoding a cipher (full Chess Room guide ).
- Pump Room – Uncover hidden passages (see Pump Room secrets).
- Parlor – Advanced logic puzzle. (Parlor Full Breakdown).
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