Blue Prince Game Vault Key Location: All 4 Vault Keys

There is no single fixed Blue Prince game vault key location. The game has four numbered Vault Keys—149, 233, 304, and 370—and each opens the matching safe-deposit box inside the Vault. Their possible spawn locations differ, although some sources such as the Music Room can produce multiple types of Vault Key under the right conditions.

Key 370 is usually the most progression-relevant one to identify because deposit box 370 contains a Sanctum Key. The other numbered boxes contain their own fixed combinations of resources, permanent upgrades, and story documents.

Because Blue Prince is built around a shifting Mount Holly estate, finding a particular key is less about walking to one permanent map coordinate and more about drafting the right rooms and understanding each key’s item pool.

This guide focuses only on the Blue Prince Vault Key puzzle: where Keys 149, 233, 304, and 370 can appear, which methods improve your chances of finding them, and exactly what to do once you reach the Vault. It is unrelated to Game Vault 999, online casino logins, or other products that use “Game Vault” in their name.

Where Is the Game Vault Key in Blue Prince?

Blue Prince Has Four Different Vault Keys

There is not one universal Vault Key in Blue Prince. The game has four separate Vault Keys: 149, 233, 304, and 370. Each one corresponds to a numbered safe-deposit box inside the Vault. (blueprince.wiki.gg)

The pairing is direct:

• Vault Key 149 → Box 149
• Vault Key 233 → Box 233
• Vault Key 304 → Box 304
• Vault Key 370 → Box 370

The Vault itself contains 372 numbered deposit boxes, but only those four have corresponding Vault Keys. Approaching a matching box while carrying its key lets you permanently unlock it. (blueprince.wiki.gg)

This is why searches for the Blue Prince game vault key location can be confusing. “Vault Key” may refer to the entire group of four items, while a player may actually be missing one specific number.

Check which numbered box or key you need before targeting rooms.

There Is No Single Fixed Vault Key Location

Vault Keys do not sit at one permanent map coordinate.

Each numbered key has its own pool of rooms where it can appear, while a smaller number of sources can generate Vault Keys more generally. For example, the Music Room can produce an unused Vault Key under the correct conditions, following its own priority order. Rare digging outcomes can also produce Vault Keys. (blueprince.wiki.gg)

This fits the structure of Blue Prince. Mount Holly changes as you play: when you reach a closed door, you draft what room appears behind it, and the manor’s floor plan resets each day. A room you found yesterday may not appear during today’s run. (store.steampowered.com)

As a result, finding a Vault Key is usually about:

1. identifying which numbered key you still need;
2. drafting rooms that can contain that specific key;
3. checking broader Vault-Key sources when they become available;
4. trying again on later days if the needed rooms do not appear.

There is no guaranteed early-game room that always contains every Vault Key.

Quick Vault Key Location Table

The room pools are not identical, so repeatedly searching a room associated with Key 149 will not necessarily help when Key 304 or 370 is the one you still need. (blueprince.wiki.gg)

Some listed rooms are tied to later discoveries, upgrades, unusual Luck, or other spoiler-sensitive conditions. The most practical approach is to start with the ordinary rooms already available in your estate and expand to later options as your save progresses.

Blue Prince Vault Key 149 Location

Where Vault Key 149 Can Spawn

Vault Key 149 has several documented room locations, making it one of the easier keys to target once you know which rooms matter.

Its main possible locations are:

• Attic
• Rumpus Room
• Security
• Throne Room after the relevant floorplan has been discovered. (blueprince.wiki.gg)

The Trophy Room can also contain Vault Key 149 with unusually high Luck, although that is a later, spoiler-sensitive option rather than the route most players should rely on first. (blueprince.wiki.gg)

Other documented ways to obtain Key 149 include:

• rare dig-spot rewards;
• lockers in the Locker Room;
• a later experimental effect that can generate a random item. (blueprince.wiki.gg)

The Music Room can also generate an available Vault Key under the right circumstances. When it reaches the Vault-Key portion of its major-key selection, Key 149 is checked before Keys 370, 233, and 304. (blueprince.wiki.gg)

For a relatively direct search, prioritize the Attic, Rumpus Room, and Security whenever they appear. Throne Room and the more specialized sources become useful additional routes as more of the estate opens up.

What Vault Key 149 Opens

Vault Key 149 opens safe-deposit box 149 inside the Vault.

The fixed contents include:

• 15 gold in three piles;
• an Allowance Token;
• a passport belonging to Samantha Hayes. (blueprince.wiki.gg)

The box remains permanently unlocked after you use the corresponding key. However, not everything inside returns on later visits.

The passport can reappear on subsequent days, but the gold does not. More importantly, the Allowance Token is only available when the box is initially unlocked, so collect it before leaving the room. (blueprince.wiki.gg)

Once Box 149 has been unlocked, Vault Key 149 is permanently removed from the available item pool. If you have been searching for Key 149 for many days without seeing it, it is worth checking whether Box 149 is already open before assuming the key is failing to spawn.

Blue Prince Vault Key 233 Location

Where Vault Key 233 Can Spawn

Vault Key 233 has its own location pool, so the rooms worth prioritizing differ from the ones used for Keys 149, 304, and 370.

Documented rooms that can contain Key 233 include:

• Office
• Sauna
• Wine Cellar
• Lavatory
• Furnace
• Morning Room
• The Kennel
• Throne Room

Some of those locations are more accessible than others. The Office, Sauna, and Wine Cellar are straightforward rooms to watch for during normal drafting, while the Lavatory, Furnace, Morning Room, Kennel, and Throne Room depend on later discoveries, special room pools, or other progression. That makes the shorter early-game list more practical if you have not unlocked many advanced rooms yet.

Key 233 can also appear from several broader item sources:

• rare dig spots;
• lockers in the Locker Room;
• the later experimental effect that grants a random item.

There are also controlled ways to obtain Vault Keys later in a save. The Music Room can produce an unused Vault Key under the right conditions, while a later Cloister/Bunk Room setup can generate two available Vault Keys and gives Key 233 the highest priority in that particular sequence.

For a spoiler-light search, prioritize Office, Sauna, and Wine Cellar whenever they appear. Expand to the later rooms only as those parts of the estate become available.

What Vault Key 233 Opens

Vault Key 233 opens safe-deposit box 233 inside the Vault.

Its fixed contents are:

• 25 gold;
• an Allowance Token;
• a passport document.

The passport contains story information, so there is no need to know its details before opening the box.

The reward timing matters more. The gold and Allowance Token are tied to the initial unlock, while the passport can appear again on later visits. In particular, the Allowance Token can be permanently missed if you leave it behind when Box 233 is first opened.

Once the box is unlocked, it stays open across future days. Vault Key 233 is then removed from the available Vault Key item pool, so you should not expect to find another copy afterward.

Blue Prince Vault Key 304 Location

Where Vault Key 304 Can Spawn

Vault Key 304 uses a different set of rooms again.

Its documented locations include:

• Conference Room
• Her Ladyship’s Chamber
• Walk-In Closet
• Hovel
• Spare Hall

The Hovel and Spare Hall are tied to later or specialized room access, so they may not be available during an earlier run.

The Drawing Room can also produce Vault Key 304 when your Luck is unusually high. It should therefore be treated as a conditional opportunity rather than a dependable farming location.

Rare dig spots are another documented source. With the later Detector Shovel, Key 304 is also among the Vault Keys that can appear from digging, though this remains an item-generation route rather than a guaranteed find.

For a focused search, draft the Conference Room, Her Ladyship’s Chamber, and Walk-In Closet when available. Those are the most direct ordinary room targets before relying on later upgrades, high Luck, or random digging.

What Vault Key 304 Opens

Vault Key 304 opens safe-deposit box 304 in the Vault.

Its fixed contents include:

• three cyan gems;
• an Upgrade Disk;
• a passport document.

The rewards behave differently after the first visit.

The three gems are one-time resources and do not reappear on subsequent days. The passport can return whenever you revisit the opened box. The Upgrade Disk can also remain available on later visits if it has not already been used.

That makes Box 304 slightly more forgiving than Boxes 149 and 233 when it comes to its unique upgrade reward, but the gems should still be collected during the initial unlock.

As with the other numbered boxes, unlocking Box 304 is permanent. Afterward, Vault Key 304 is removed from the available item pool rather than spawning repeatedly in future runs.

Blue Prince Vault Key 370 Location

Where Vault Key 370 Can Spawn

Vault Key 370 has a relatively narrow set of direct room locations, which makes it useful to target specific drafts instead of hoping it appears as generic loot.

Its documented room locations include:

• Throne Room
• Lost & Found (blueprince.wiki.gg)

Both are progression-sensitive floorplans, so players earlier in a save may not yet have access to the most direct Key 370 rooms.

The Closed Exhibit can also contain Vault Key 370 when Luck is unusually high. Because that requires both access to the room and favorable Luck conditions, it is better treated as an additional opportunity than a dependable route. (blueprince.wiki.gg)

Rare dig spots can produce Key 370 as well. This method is possible but highly random, so it should not be your main strategy when the missing key is specifically 370.

Key 370 can also come from sources that draw from the wider Vault Key pool. The most useful example is the Music Room. When its other major-key possibilities are unavailable and at least one unused Vault Key can still spawn, the room can provide a Vault Key. Its documented Vault Key priority is:

149 → 370 → 233 → 304 (blueprince.wiki.gg)

That makes the Music Room especially useful for Key 370 once Key 149 is no longer eligible to appear.

Why Vault Key 370 Is Especially Important

Vault Key 370 opens safe-deposit box 370 inside the Vault.

The box contains several fixed rewards, including:

• a stack of 40 gold;
• a Sanctum Key;
• a story letter connected to the other deposit boxes. (blueprince.wiki.gg)

The Sanctum Key is the important progression item here.

It is not another name for Vault Key 370. Vault Key 370 is used specifically to open deposit box 370. The Sanctum Key is a separate key found inside that box and is used for later progression elsewhere in the game.

That distinction helps explain why players often prioritize Key 370 after learning what its deposit box contains. The Vault Key solves one step; opening the box gives you a different item needed for the next part of the progression chain.

The Sanctum Key can remain available on later visits if it has not already been used, while the story document can also reappear. (blueprince.wiki.gg)

What to Do if Vault Key 370 Will Not Spawn

If Key 370 seems impossible to find, first stop treating every loot source as equally useful.

Use this order of priorities:

1. Draft Throne Room or Lost & Found when either becomes available.
2. Check Closed Exhibit if you have access to it and unusually high Luck.
3. Use the Music Room strategically once earlier Vault Keys in its priority sequence are unavailable.
4. Use later controlled Vault-Key methods when unlocked.
5. Treat digging as a backup rather than the main plan.

There is another important mechanic to understand: once a Vault Key has been used to permanently unlock its matching box, that key is removed from the available item pool and will never spawn again. The game does not technically consume it during the interaction, but it becomes permanently unavailable afterward. (blueprince.wiki.gg)

That can actually help later searches because fewer Vault Keys remain eligible for shared Vault-Key sources such as the Music Room.

For example, the Music Room checks Vault Keys in the order 149, 370, 233, 304. If Box 149 has already been unlocked and its key is no longer available, Key 370 moves to the front of that Vault-Key sequence when the Music Room reaches this part of its item logic. (blueprince.wiki.gg)

Digging is less controlled. Datamined Detector Shovel data lists all four Vault Keys as possible results, but Key 370 appears in a lower-probability branch than the other Vault Keys. That makes digging useful as a bonus opportunity, not a reliable same-day solution. (blueprince.wiki.gg)

There is no guaranteed same-day Key 370 route unless the required rooms, upgrades, and remaining item-pool conditions already line up.

Best Ways to Get Vault Keys in Blue Prince

Use the Music Room to Target the Vault Key Pool

The Music Room is one of the best general methods for finding a missing Vault Key because it can select from the remaining Vault Key pool under specific conditions.

It does not simply generate a Vault Key every time.

The room will move to a Vault Key when its other available major-key options cannot spawn and at least one unused Vault Key remains available. When that happens, the documented priority is:

1. Vault Key 149
2. Vault Key 370
3. Vault Key 233
4. Vault Key 304 (blueprince.wiki.gg)

This priority makes earlier Vault Key progress useful.

Suppose Box 149 has already been opened. Key 149 has therefore left the item pool. If the Music Room reaches its Vault-Key selection, Key 370 becomes the next Vault Key it attempts to provide.

The same principle continues as more boxes are unlocked.

Your current major-key situation also matters. If another eligible major key can occupy the Music Room’s key slot, you may receive that instead of a Vault Key. So drafting the Music Room alone is not a guarantee.

The useful strategy is to combine it with knowledge of which major keys and Vault Keys are still available rather than repeatedly drafting the room without checking the item pool.

Use the Bunk Room Through the Cloister of Mila

A later, upgrade-sensitive method can produce two Vault Keys at once.

After unlocking the relevant Cloister of Mila setup, drafting the Bunk Room from the Cloister causes it to contain two Vault Keys when at least two are still available and the Silver Key is not eligible for that slot. (blueprince.wiki.gg)

The Vault Keys follow this priority:

233 → 370 → 304 → 149 (blueprince.wiki.gg)

That sequence is different from the Music Room.

For example, if all four Vault Keys remain eligible, the Bunk Room setup prioritizes 233 and 370. If Key 233 has already been removed from the item pool, Key 370 moves to the front.

This is a strong targeted method for later saves, but it depends on progression that newer players may not have reached. Treat the Cloister route as an upgrade/spoiler-sensitive strategy rather than an early-game solution.

Search Key-Specific Rooms Instead of Only Random Loot

The most straightforward way to improve your odds is to target rooms associated with the exact Vault Key you still need.

A simple checklist is:

• Need 149: prioritize Attic, Rumpus Room, and Security.
• Need 233: prioritize Office, Sauna, and Wine Cellar.
• Need 304: prioritize Conference Room, Her Ladyship’s Chamber, and Walk-In Closet.
• Need 370: prioritize Throne Room and Lost & Found when available. (blueprince.wiki.gg)

Later rooms, high-Luck locations, upgrades, and special sources add more options, but these targeted pools give each search a clearer direction.

This is much more efficient than treating every room as equally likely.

If you need Key 149, for example, drafting an Attic gives you a documented direct opportunity. If you need Key 370, repeatedly searching unrelated early rooms will not create the same targeted chance that Lost & Found or Throne Room provides.

Dig Spots Can Work, but They Are Rare

Digging can produce any of the four Vault Keys, so it is worth checking dig spots when you already have the necessary tool.

It should not be your only plan.

The Vault Key documentation describes dig spots as a rare source for all four numbered keys. (blueprince.wiki.gg)

Later Detector Shovel data illustrates how uneven those outcomes can be. Its datamined table includes all four Vault Keys, but Vault Key 370 occupies a particularly low-probability branch compared with the other numbered keys. (blueprince.wiki.gg)

Use digging as an extra chance while pursuing a more controlled route:

• draft key-specific rooms;
• use Music Room logic when possible;
• use the Cloister/Bunk Room method later;
• dig when suitable spots appear along the way.

That way, a failed dig does not consume the entire strategy for the day.

How to Use a Vault Key Once You Find It

Draft the Vault Room

Finding a Vault Key is only half of the process. You still need to draft the Vault itself.

The Vault is a distinct Blue Prince floorplan listed as Room 023 in the Room Directory. It is a Rare Dead End room rather than a permanent location that automatically appears after obtaining a Vault Key. (blueprince.wiki.gg)

Carrying Key 149, 233, 304, or 370 therefore does not reveal the Vault or force it into your current estate.

You must still draft the room through the normal floorplan system.

The Vault is valuable even beyond its numbered boxes. It always contains eight piles of five gold for 40 total gold, and it can also contain one of several additional items such as a basic key, Coupon Book, Keycard, Lock Pick Kit, or Trunk. (blueprince.wiki.gg)

The numbered deposit boxes are the part that interacts specifically with Vault Keys.

Match the Key Number to the Deposit Box

Inside the Vault are 372 safe-deposit boxes arranged across the walls.

They are initially closed and cannot normally be interacted with. When you approach a box while carrying the corresponding Vault Key, that specific box becomes interactable. (blueprince.wiki.gg)

The four standard matches are:

• Vault Key 149 → Box 149
• Vault Key 233 → Box 233
• Vault Key 304 → Box 304
• Vault Key 370 → Box 370

The number is exact. Vault Key 370 does not open another box simply because it is nearby, and carrying Vault Key 149 does not make every locked box usable.

With hundreds of boxes lining the room, use the number on the key rather than checking lockers at random.

Each of the four matching boxes has fixed contents, so unlocking a particular number always leads to that box’s specific reward set.

Vault Box Unlocks Are Permanent

Using a Vault Key permanently unlocks its matching deposit box.

The box remains unlocked on future days, and you can open or close its door again whenever you return to the Vault. (blueprince.wiki.gg)

There is a useful technical distinction: the Vault Key is not consumed by the unlocking interaction, but after the box has been opened, that key is permanently removed from the game’s available item pool. It cannot be found again. (blueprince.wiki.gg)

That permanent state matters for two reasons.

First, it narrows future Vault-Key selection in places such as the Music Room.

Second, some box rewards are available only on the initial unlock. Resource items generally do not respawn on later days, while certain documents and unused unique items may return depending on the box. (blueprince.wiki.gg)

When opening a deposit box for the first time, collect the useful resources before leaving the Vault rather than assuming everything will still be waiting on your next visit.

Vault Key vs Vault Room vs Sanctum Key

A Vault Key Opens a Numbered Deposit Box

In Blue Prince, a Vault Key is not a key for the entrance to the Vault room.

There are four standard Vault Keys:

• 149
• 233
• 304
• 370

Each key corresponds to one numbered safe-deposit box inside the Vault. Holding the correct key makes its matching box interactable: Key 149 opens Box 149, Key 233 opens Box 233, and so on. (blueprince.wiki.gg)

The Vault itself does not require one of these four keys to enter. It is a room that must be drafted through the normal estate system.

That distinction matters because a player can find Vault Key 370, for example, and still be unable to use it until the Vault appears in a later draft.

The Vault Is the Room Containing the Deposit Boxes

The Vault is a separate room in Mount Holly. The Room Directory lists it as Room 023, and it is classified as a rare Dead End room. (blueprince.wiki.gg)

Inside are 372 numbered safe-deposit boxes lining the walls. Most remain locked and uninteractable, but carrying one of the four corresponding Vault Keys lets you unlock its specific box. (blueprince.wiki.gg)

So there are two separate requirements for claiming a Vault-box reward:

1. find the numbered Vault Key;
2. successfully draft the Vault room.

Finding one does not automatically provide the other.

The Sanctum Key Inside Box 370 Is a Different Progression Item

Deposit box 370 contains a Sanctum Key, but the Sanctum Key and Vault Key 370 are not the same item. (blueprince.wiki.gg)

The progression sequence is:

Find Vault Key 370 → draft the Vault → open Box 370 → collect the Sanctum Key

Vault Key 370 therefore solves the safe-deposit-box step. The Sanctum Key obtained afterward belongs to a different part of the game’s progression.

Box 370 also contains a fixed stack of gold and a story letter. The Sanctum Key can reappear in the already-open box on a later day if it has not yet been used, while the letter also returns on subsequent visits. (blueprince.wiki.gg)

Referring to both items simply as “the Vault Key” can make walkthroughs confusing. When following a guide, check whether it means Vault Key 370, which opens the deposit box, or the Sanctum Key found inside Box 370, which is used afterward.

Blue Prince Vault Key Not Appearing

You May Be Searching the Wrong Rooms for That Number

The four Vault Keys do not share one identical room pool.

If a particular key refuses to appear, first confirm which number you are missing and target rooms that can actually contain it.

A useful short list is:

• 149: Attic, Rumpus Room, Security
• 233: Office, Sauna, Wine Cellar
• 304: Conference Room, Her Ladyship’s Chamber, Walk-In Closet
• 370: Throne Room, Lost & Found (blueprince.wiki.gg)

Other conditional and later-game locations exist, but these room-specific pools explain why searching indiscriminately can produce long dry streaks.

For example, repeatedly drafting the Attic makes sense when hunting Key 149. It does not create the same targeted opportunity for Key 370.

Some Locations Require Later Rooms, Upgrades, or Conditions

Not every documented Vault Key location will be available at the same stage of a save.

Several useful sources depend on later discoveries or special conditions. These include locations and routes such as:

• Throne Room
• Lost & Found
• Closed Exhibit
• Hovel
• Spare Hall
• Cloister-related Vault Key methods

Some conditional rooms also require unusually high Luck before a particular Vault Key can appear. (blueprince.wiki.gg)

If you are still relatively early in the game, focus on ordinary rooms already accessible to you rather than assuming that every location mentioned in a complete Vault Key list should currently be draftable.

Later progression expands the number of ways you can target missing keys.

Random Sources Are Not Guaranteed

Rare dig spots and general item-generation methods can produce Vault Keys, but randomness makes them unreliable as a primary farming method.

A key failing to appear after several digs does not mean that it is bugged or permanently unavailable. It may simply be a low-probability outcome.

The stronger approach is to combine several methods:

• target rooms associated with the missing number;
• use the Music Room when its major-key conditions favor a Vault Key;
• use later controlled Vault-Key routes when unlocked;
• treat digging as an additional chance rather than the entire strategy.

The Music Room is particularly useful because its Vault Key selection follows a documented priority of 149 → 370 → 233 → 304, provided its other major-key choices are unavailable and an eligible Vault Key remains. (blueprince.wiki.gg)

That gives you more control than repeatedly relying on random loot.

Check Whether You Already Used That Vault Key

If a Vault Key appears to have stopped spawning entirely, check its corresponding deposit box.

Once you permanently unlock a box, the associated Vault Key is removed from the available item pool and will not appear again. (blueprince.wiki.gg)

The four pairs are:

• Key 149 → Box 149
• Key 233 → Box 233
• Key 304 → Box 304
• Key 370 → Box 370

Because unlocked Vault boxes remain permanently open across future days, revisit the Vault and inspect the relevant number before spending more runs searching for a key you have already used.

This mechanic can also help with the remaining keys. Removing one used key from the item pool narrows the eligible Vault Keys that broader sources such as the Music Room can select.

Blue Prince Is Not Game Vault 999 or an Online Casino Game

This Guide Is About the Blue Prince Puzzle Item

This page refers specifically to Vault Keys in Blue Prince.

Blue Prince is a strategy and puzzle adventure developed by Dogubomb and published by Raw Fury. Its setting is Mount Holly, a manor whose rooms change as players draft their route through the estate. (store.steampowered.com)

The Vault Keys discussed here—149, 233, 304, and 370—are items inside that game. They are used with safe-deposit boxes in the Vault room.

They are not APK download keys, account codes, casino login credentials, promo codes, or payment-related items.

Game Vault 999, “Game Vault Freeplay,” and Casino Searches Are Different

Broad searches containing game vault can surface completely unrelated products.

Queries such as:

• Game Vault online play;
• Game Vault 999 online login USA;
• Game Vault freeplay;
• open the vault casino game

do not describe the Blue Prince Vault Key puzzle covered on this page.

Game Vault 999, for example, is a separate mobile gaming service. Its current FAQ says it is accessed through Android or iOS apps and does not offer a web version. (gamevault999.com)

Nothing about that service determines where Vault Key 149, 233, 304, or 370 appears inside Blue Prince.

Likewise, a casino-style game using “vault” in its title should not be assumed to have any connection to Blue Prince simply because the search terms overlap.

Use the Entity Guide if You Reached the Wrong “Game Vault”

If your goal is to find a mobile Game Vault app, login, APK, agent, or platform information, this Blue Prince walkthrough is the wrong branch of the topic.

Use the broader Game Vault entity guide to identify which product you mean, or go directly to the Game Vault 999 guide for mobile download and account information.

Conclusion

The Blue Prince game vault key location is not a single fixed spot. Vault Keys 149, 233, 304, and 370 each have their own room pools, and the manor’s changing layout means the best route depends on which number you still need.

Target the relevant rooms first, then use broader sources such as the Music Room, later Cloister-related methods, or digging when they fit your current progression. Key 370 deserves particular attention because its matching deposit box contains a Sanctum Key.

Once you find a Vault Key, you still need to draft the Vault and open the box with the matching number. Since that unlock is permanent and certain first-time rewards do not return, collect important resources before leaving. If a key seems to have stopped spawning, check the corresponding Vault box first—it may already be permanently unlocked.

FAQ

Quick Fact-Checks

Game ratingsRating and content details for released games are available from the ESRB.