The Basement beneath Blue Prince holds one of Mt. Holly’s most cryptic secrets. But getting there isn’t straightforward—expect to jump through architectural hoops, manipulate room drafts in precise ways, and track down a key hidden in a seemingly random location. That’s just how Blue Prince operates.

Here’s your guide to unlocking the Basement and finding the key that makes it all possible.

How to Reach the Basement

The Basement won’t even appear on your radar until you’ve accessed the Foundation—the central hub room of the manor. Inside, you’ll notice an elevator, but it’s initially nonfunctional.

To bring it online:

• Draft a room directly to the right of the Foundation.
• Ensure this new room has a door on its left wall (so it aligns with the Foundation’s doorway).
• Upon entering this room, the door will transform into a mechanical elevator control.
• A brief animation will play, showing the elevator descending.

Now, return to the Foundation—its elevator is now active and ready to carry you down into the hidden Basement.

How to Obtain the Basement Key

Even after reaching the Basement, you’re not quite in. The door at the bottom remains locked, requiring the elusive Basement Key. And where is it? Not nearby.

• The key resides in the Antechamber, a secluded room located in the northernmost wing of the estate.
• The Antechamber may not appear immediately in your draft options—keep playing until it surfaces.
• Once you’ve drafted and entered it, the Basement Key will be yours.

This key also grants access to the Well Door beneath the Fountain, opening up an alternative path through the Underground tunnels.

Read More: Blue Prince Tips and Tricks*

Why You Should Explore the Basement

This isn’t just a side-room for collectors. The Basement features a puzzle connected to the levers in the Antechamber—an essential link in the chain leading to Room 46. If you're aiming to uncover every secret Mt. Holly conceals, the Basement is unavoidable.

Final Thoughts

The Basement is a cleverly buried component of Blue Prince’s intricate puzzle structure. You’ll need to draft strategically, navigate the manor’s shifting layout, and detour far from your goal for one small key. But what lies behind that door? More than just shadows—it’s a gateway to deeper layers of the mystery.

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