Blue Prince Inner Sanctum Guide – All Sanctum Key Locations, Puzzle Solutions & Room 46 Access

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If you’ve made it to the Inner Sanctum in Blue Prince, congrats—you’re deep in the heart of one of the game’s most intricate puzzle chains. This area isn't just a test of logic, but a full-on mind maze with Sanctum Keys to collect, sigils to solve, and the mysterious Room 46 to unlock.

In this guide, we’ll break down where to find all 8 Sanctum Keys, how to solve the Sigil Puzzles, tackle the Mora Jai Box puzzles, and share some community tips to keep your brain from melting.

🗝️ How to Unlock the Inner Sanctum

The Inner Sanctum is hidden beneath the Mt. Holly estate, and getting in requires all 8 Sanctum Keys. Each key is tucked away in major rooms throughout the mansion.

Here’s where you’ll find them:

  1. Vault Room – Solve the rotating statue puzzle. (Vault Room guide)  

  2. Clock Tower – Time-based puzzle tied to bell chimes. (Clock Tower guide)

  3. Reservoir – Requires adjusting water flow (see Reservoir guide).

  4. Throne Room – Hidden lever beneath the throne. (Throne Room guide)

  5. Breaker Box Room – Solve the VAC sequence (Breaker Box Room guide).

  6. Chess Room – Requires decoding a cipher (full Chess Room guide ).

  7. Pump Room – Uncover hidden passages (see Pump Room secrets).

  8. Parlor – Advanced logic puzzle. (Parlor Full Breakdown).

Once you’ve got all 8, head to the Sanctum Gate and insert them one by one.

🧩 Sanctum Sigil Puzzles – Step-by-Step Help

Blue Prince, Room 46 Door
Inside the Inner Sanctum, you’ll face eight unique Sigil Puzzles. Each one is like a locked vault requiring a specific combination of symbols.

🗒️ Tips:

  • Use the sigil wall references found in nearby rooms—don't just guess.

  • Each lever corresponds to a piece of the sigil. Some rotate, some flip.

  • Work left to right when matching symbols to keep orientation consistent.

💡 For visual help, check this helpful Steam Community thread where users are posting image breakdowns.

🎨 Mora Jai Box Puzzles – Color Grid Challenge

If you love color puzzles, you’re in for a treat (or a headache). The Mora Jai Boxes are 3x3 grid puzzles that require aligning colors by shifting tiles.

✅ What to know:

  • You’ll need to match a target pattern using a limited number of moves.

  • Some tiles shift adjacent pieces, others rotate colors.

  • There’s no “undo,” so plan ahead.

🔥 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

🗝️ Unlocking Room 46

Once all Sanctum puzzles are solved, you’ll finally gain access to Room 46, the final hidden chamber behind the Antechamber levers.

🎉 Expect:

  • Lore drops

  • New mechanics revealed

  • …and a very satisfying payoff if you’ve been mapping everything so far.

💬 Community Support

Still stuck? Join the conversation and find help here:

📝 Final Thoughts

The Inner Sanctum is Blue Prince at its best—deep, layered puzzles that reward careful thinking and exploration. Whether you’re a lore hunter or puzzle pro, cracking this area is a badge of honor. 

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