Master Key

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Master Key
Master Key image.png
Opens all doors in the estate that can be opened with standard keys.
― Item description

The Master Key is a luxury special item in Blue Prince. The most expensive of the Showroom items, the Master Key effectively acts like a reusable basic key, capable of unlocking any number of standard locked doors.

How to obtain

The Master Key is not usually in the item pool, but it has a moderate chance of appearing for sale in the Showroom, where it costs 80.

  • [Major Constellation: Spiral of Stars] The Spiral of Stars has a chance to directly give the player a free Master Key when it is activated, if it has at least 46 words and the player has fewer than 40 by the time the Showroom effect triggers. See Spiral of Stars#46 - 56 details for more information.

Spoilers Within

This section contains spoilers for trading.

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Some item sources are capable of providing a Master Key if it is present in the item pool, which Showroom items are not by default. However, trading items at the Trading Post re-adds items to the item pool, meaning that acquiring a Master Key from another source and trading it away will allow the Master Key to be reacquired from those sources.

  • Trading the Master Key means that the Locksmith can sell a Master Key as its special key if its other options are unavailable.
  • Trading the Master Key means that the Music Room may contain a Master Key if its other "major keys" are not available, including the Vault Keys. However, it is bugged and cannot actually be picked up.

Usage

When interacting with a locked door, this item appears in the Special Keys menu. Using it unlocks the door as if a normal key had been used, and the Master Key is not consumed.