Are you looking for the Sanctum Keys in Blue Prince? There are eight of these in total, and finding them is no small feat. You're bound to revisit the manor and other locations multiple times across several runs. Our guide discusses all of these details, but please be aware that there are major spoilers ahead.
Where to find all Sanctum Keys in Blue Prince - Sanctum Key locations guide
The Sanctum Keys are your next main objective in the campaign. Here's what you need to know:
- As you approach the Antechamber and Room 46, you're told that you need to go down to the Underground. There, you'll find the lever that opens the path into Room 46, as well as eight other strange doors.
- Once you reach Room 46 for the first time, Simon will successfully claim his inheritance.
- On your next run, you'll notice a lot of changes in the manor, including new rooms and secrets.
- If you manage to revisit Room 46, you'll see more documents and clues, including a letter about the Sanctum Keys. These are the items that you need to unlock the eight doors in the Underground.
Sanctum Key 1 and the all the clues: Room 46

The first Sanctum Key in Blue Prince, as well as the clue that pertains to the locations of the others, can be found in Room 46. The poem mentions the following:
- First key: "Found here on the furthest rank."
- Second key: "Locked tight in the vault of a bank."
- Third key: "High up among all the clocks."
- Fourth key: "Beneath all the docks."
- Fifth key: "Held by a king on his throne."
- Sixth key: "Left in a station by one of your own."
- Seventh key: "A major if you draft it quite late."
- Eighth key: "Behind the last door of eight."
That's quite a doozy, right? Fortunately, some of the hints are fairly obvious, so it's just a matter of being lucky enough to draft them and finding certain items that you need.
Sanctum Key 2: The Vault

This Sanctum Key is found in the Vault, but you need to acquire a specific item: Deposit Box Key #370. The problem is that ...