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In the captivating adventure of Blue Prince, the Sanctum Key becomes a core obsession for players, representing not just access, but possibility itself. Gaining the Blue Sanctum Key means you’re ready for a new level of exploration, unraveling the mysteries that wind their way through the game’s procedurally generated mansion. Whether you’re scouring shadowed corridors for rare clues, solving hidden puzzles, or plotting your route to the next locked door, everything revolves around the allure and intrigue of the “Blue Prince: Sanctum Key.” This guide unpacks what it is, how to find it, and exactly how to wield it for maximum success in your journey to claim the crown.
The Sanctum Key in Blue Prince is a rare, game-changing item that unlocks high-level sanctum chambers somewhere deep within the enigmatic mansion. The game itself spins a spellbinding, rogue-lite mystery, combining environmental storytelling, puzzle-solving, and dynamic exploration. The Sanctum Key is not just a literal key, but a symbol of game progression; it lets you access hidden layers, secret lore, and treasure rooms that most players only dream of discovering. Like any great gaming mystery, its location and use shift with every new run, making every attempt to obtain the Sanctum Key as exciting as the last.
How to Find the Sanctum Key
- Persistent Exploration: The Sanctum Key rarely appears in obvious places. Search each procedurally generated room thoroughly—look for hidden levers, secret panels, or codes left in journals.
- Solve Mysteries: Certain complex puzzle rooms reward sharp-eyed players with the Sanctum Key. These may involve logic puzzles, combinations, or time-limited tasks.
- Defeat Guardians: Occasionally, mini-boss guardians protect the key. Prepare your gear and strategies before tackling these formidable foes.
- Trade and Barter: Some NPCs in the mansion may offer the key in exchange for rare artifacts or as a reward for completing complex side quests.
Here are the exact locations for all eight Sanctum Keys in Blue Prince, based on in-game clues and verified guide sources—each key is required to open one of the eight locked Sanctum Doors in the Underground. Each key is found in a unique spot, often behind a significant puzzle or set-piece event. Some keys may have minor randomization or require particular in-game conditions (such as drafting specific rooms), but these are their core locations:
All Sanctum Key Locations in Blue Prince
1. Room 46
- Location: On the desk in Room 46 (your first time entering Room 46 in the Underground).
- Details: Simply pick it up from the desk; this is your starting key and also where you’ll find a poem giving clues to the remaining keys.
2. The Vault (Deposit Box #370)
- Location: Inside the Vault, unlocked with Deposit Box Key #370.
- How to get: You need to find Deposit Box Key #370, usually in the Lost and Found room, Coat Check, or trunk. After finding the key, go to the Vault and open Box #370.
3. Clock Tower
- Location: Inside the Clock Tower, revealed at exactly 1:30 (in-game time).
- How to get: Draft the Clock Tower floorplan, be inside the tower at 1:30, then solve the clock puzzle by setting the clocks (from left to right) to: 5:00, 5:08, 5:57, 6:00, 7:00, 8:00, 8:05, and 9:00.
4. Reservoir (Underground)
- Location: Inside a black chest with a moon symbol, found at the bottom of the Reservoir after fully draining the water.
- How to get: Use the Boiler Room (or similar power source) to power the Pump Room and fully drain the Reservoir; head down to the basin and open the correct chest [the black moon box].
5. Throne Room
- Location: On a table beside the candelabra in the Throne Room.
- How to get: Complete the Laboratory puzzle to access Blackbridge Grotto, collect all Microchips, place them in the Grotto pedestal, then draft the Throne Room with your floorplans. The key will be found as described once you enter the Throne Room.
6. Safehouse (Reservoir Boat)
- Location: On a crate next to the sofas in the Safehouse.
- How to get: In the Reservoir, adjust the water level (not fully drained, but enough to use the boat). Take the boat to access the Safehouse in the Underground; the key is inside.
7. Music Room (Major Key)
- Location: On the Major Key podium in the Music Room.
- How to get: Draft the Music Room after at least 37 rooms have been drafted (late in the game, on rank 9) to spawn the key. Sometimes described as “a major if you draft it quite late” in clues. May require letting your game idle and drafting the Music Room near the end of your run.
8. Mechanarium (Eight Doors/Final Key)
- Location: Mechanarium Room in the Underground, after opening seven doors.
- How to get: Place the Mechanarium in a spot where directional doors are blocked except diagonals, and draft four mechanical rooms to open the final compartment. The eighth Sanctum Key appears in the Mechanarium after the previous seven have been found and doors opened.
Note: All keys are one-time use (single-use) and any missed key resets if you leave it uncollected when ending your run.
Using the Sanctum Key: Tips and Strategies
- Unlock the Blue Sanctum: Find the distinctive blue-carved sanctum door—these always require the Sanctum Key and lead to treasure vaults, cryptic lore drops, and shortcut passages.
- Plan Your Path: Unlocking a sanctum can reveal new shortcuts or alternate routes to the fabled Throne Room—using the key at the right time can save your run.
- Watch for Traps: Elder sanctums often house tricky traps. Bring tools or consumables that counter poison, gas, or spectral guardians.
- Reap Rewards: Inside sanctums, players can find rare relics, special abilities, powerful upgrades, and pieces of the Blue Prince’s backstory.
Advanced Hints for Sanctum Mastery
- Use map fragments and clue pieces you find to triangulate where a sanctum is likely hidden—it’s different every playthrough!
- Combining abilities (such as invisibility or speed boots) can help you bypass or solve environmental obstacles between you and a sanctum door.
- Remember: dying means you lose your progress—use the Sanctum Key only if you feel truly ready for what’s ahead!
Why the Sanctum Key Matters in Blue Prince
The “Blue Prince: Sanctum Key” is more than item-gated content; it’s the heartbeat of exploration in an ever-evolving mansion. Mastering it dramatically improves your progression odds, storyline access, and standing on the leaderboards. Whether you want every achievement or just to experience the game’s deepest secrets, learning the ropes of sanctum hunting is a rite of passage.
