The Clock Tower in Blue Prince isn’t just another strange room you draft on your path toward Room 46—it’s a masterclass in tension, timing, and logic. By combining a strict real-time requirement with a layered truth-and-lies deduction puzzle, the Clock Tower stands as one of the game’s most memorable rites of passage.
If you’ve found yourself staring at a cryptic poem, eight grandfather clocks, and a ticking in-game clock that refuses to slow down, you’re not alone. This definitive 2025 Clock Tower guide walks you through every step, from permanently unlocking the blueprint to solving the clock logic puzzle and earning one of the eight Sanctum Keys required for endgame progression.
Take a breath—time is already ticking.
๐ Accessing the Clock Tower: How to Draft the Blueprint
Your journey to the Clock Tower begins outside the tower itself, inside one of the most important utility rooms in Blue Prince.
Unlocking the Blueprint
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The Clock Tower blueprint appears only in the Drafting Studio
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The Drafting Studio presents three random rare blueprints
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The Clock Tower appears as a tall, spire-like structure
Once selected, the Clock Tower blueprint is:
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Permanently added to your drafting pool
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Eligible to appear in future runs like any other room
Key Strategy
You do not need to solve the Clock Tower puzzle on the same run you unlock the blueprint. Simply drafting it once is enough. On a later run, your goal is to:
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Draft the Clock Tower from your room choices
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Reach it before the Sacred Hour
This separation makes the puzzle more forgiving—but only if you plan ahead.
⏳ The Sacred Hour: Understanding the Time Requirement
Upon entering the Clock Tower, you’ll notice something unusual:
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A central clock frozen at 1:30 PM
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Surrounding clocks that display live in-game time
This is the game’s clearest hint:
๐ The puzzle only activates at exactly 1:30 PM in-game.
How In-Game Time Works
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Time progresses quickly
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Roughly 8 real-world minutes = 1 in-game hour
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Each day begins at 8:00 AM
That gives you approximately 27 real-world minutes to:
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Draft the Clock Tower
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Navigate to it
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Be standing inside when the clock strikes 1:30 PM
Missed the Window?
Don’t worry:
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You cannot trigger the puzzle at 1:30 AM
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Leaving after missing the time simply continues the day
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You must end the run and try again on a future day
Critical Warning
When the clock hits 1:30 PM, a short cutscene plays and a hidden door opens.
⚠️ If you leave the Clock Tower after this point, the door closes.
You must solve the entire puzzle in one uninterrupted visit.
๐งฉ The Eight Grandfather Clocks: Rules, Lies & Logic
Behind the hidden passage lies the true puzzle chamber: eight grandfather clocks, each paired with a note describing a rule.
The Color Code (Very Important)
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Blue notes → Always true
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Red typed notes → Always false (must be inverted)
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Red handwritten notes → True (the exception)
Misreading even one note will break the solution.
Clock Rules Explained
| Clock | Note Color | Statement | How It Applies |
|---|---|---|---|
| 1 | Blue | Each clock must show a different time | All eight times must be unique |
| 2 | Blue | Five clocks must end on the hour | Exactly five :00 times |
| 3 | Red (Typed) | Time must contain all different numbers | False → must repeat a digit |
| 4 | Blue | Both neighbors must contain a 7 | Adjacent clocks must include “7” |
| 5 | Red (Typed) | This clock should not be on the hour | False → must be on the hour |
| 6 | Blue | No times may contain 1–4 | All times must be between 5:00–9:59 |
| 7 | Blue | One clock mirrors another | Reversed digit pair (e.g. 5:08 / 8:05) |
| 8 | Red (Handwritten) | Times ascend left to right | True → order matters |
✅ The Verified Clock Tower Solution
After applying all constraints correctly, there is one confirmed valid solution.
Set the clocks from left to right as follows:
5:00 – 5:08 – 5:57 – 6:00 – 7:00 – 8:00 – 8:05 – 9:00
Why This Works
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✅ Five on-the-hour times:
5:00, 6:00, 7:00, 8:00, 9:00 -
✅ “7” neighbors rule:
Clock 4 is flanked by 5:57 and 7:00 -
✅ Mirrored times:
5:08 ↔ 8:05 -
✅ Red typed lies inverted correctly:
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Clock 3 repeats digits (5:57)
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Clock 5 is on the hour (7:00)
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✅ Ascending order maintained:
Times increase cleanly left to right
๐ก Pro Tip
Many near-solutions fail because:
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A red typed note was treated as true
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A time includes forbidden digits (1–4)
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The ascending rule is accidentally broken
If the puzzle doesn’t resolve, re-check every red typed note first.
๐️ Reward: The Clock Tower Sanctum Key
Solving the puzzle opens a small drawer in the central clock, revealing:
๐ A Sanctum Key
This key is:
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One of eight total Sanctum Keys
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Required to unlock the Inner Sanctum
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Essential for post-game content, Sigil puzzles, and advanced Mora Jai boxes
Once collected, the Clock Tower’s role in your estate is complete—but your journey is far from over.
⏱️ Final Thoughts: Why the Clock Tower Matters
The Clock Tower puzzle is a perfect encapsulation of Blue Prince:
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Drafting strategy
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Time management
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Environmental storytelling
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Truth-versus-lie logic
It rewards players who observe carefully, plan patiently, and think precisely under pressure. Claiming its Sanctum Key marks a major milestone on the road to mastering Mount Holly.
๐ฌ Community & Resource Links
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r/BluePrince players share theories about alternate time sequences: 6:30, 3:45, and mirrored times like 11:10.
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Steam Community threads discuss using the Throne Room bell pattern as a clue.
Want to explore more puzzles? Check out:
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