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Blue Prince / Clock Tower puzzle

Blue Prince Clock Tower puzzle: eight clock times

Quick answer

Stay inside the Clock Tower until the hidden room opens at 1:30. In that room set the eight clocks from left to right to 5:00, 5:08, 5:57, 6:00, 7:00, 8:00, 8:05, 9:00. Finish the clocks before leaving; the compartment then reveals the Sanctum Key.

Trigger the hidden room

  1. Use the Drafting Studio to activate the Clock Tower floorplan before trying to draft it; an unactivated floorplan will not appear as a normal option.
  2. Draft the Clock Tower and be inside before 1:30 PM in-game. The sacred-hour event opens the hidden room at 1:30 PM.
  3. Enter the room and solve it in the same visit. The secret room is not permanently open; after Patch 1.7, missing the PM window can be retried at the next 1:30 AM, so do not treat older “once per day” guides as current.

Set the eight clocks

Clock positions, left to right
PositionTime
15:00
25:08
35:57
46:00
57:00
68:00
78:05
89:00
Clock Tower eight-clock sequenceAn original left to right sequence of eight clock positions and their times.SET LEFT → RIGHT15:0025:0835:5746:0057:0068:0078:0589:00Sequence only — not the physical room layout.

Swipe sideways to read all eight clock positions.

Original position schematic — use the leftmost-to-rightmost order, not guessed clock locations.

Use the digital-style times exactly, including the minutes. The list is ordered from the leftmost clock to the rightmost clock; it is not a claim about where the clocks sit in the tower.

Confirm the reward

When all eight displays match, a small compartment opens and exposes the Sanctum Key. If nothing happens, check that you are in the hidden room, that no two displays share a time, and that the clocks are read left to right.

Sources

The Drafting Studio floorplan prerequisite, 1:30 PM trigger, left-to-right sequence, retry timing, and Sanctum Key reward are cross-checked against Pro Game Guides’ Clock Tower walkthrough and the current Blue Prince Wiki Clock Tower page. The current wiki records the post-Patch-1.7 1:30 AM retry window; official Patch 1.7 notes explicitly fixed the sacred-hour bug that accepted PM but not AM. Both puzzle references publish the same eight times. This page does not infer a different clock arrangement from player-made variants.