You’ve been wandering the halls of Mount Holly for hours. Maybe days. Your boots are dusty, your inventory is a mess of keys and cryptic notes, and you’re starting to suspect that the "buried floorplan" everyone whispers about is just another one of Simon’s hallucinations. It isn't.
But honestly, the game doesn't make it easy. Blue Prince is a masterclass in making you feel like a genius one second and a complete idiot the next. The blue prince buried floorplan—specifically the one that unlocks the Lost and Found room—is one of those "hidden in plain sight" secrets that drives players absolutely wild.
If you’re tired of clicking on every pixelated brick in the basement, let’s just get into it. No fluff.
Where the Clues Are Hiding
Most people miss the first step because they’re too busy trying to reach Room 46. You have to go underground. Specifically, you need to find your way to the Rotating Gear section in the depths of the estate.
There is a giant map of the underground down there. It looks like standard set dressing, right? Wrong. If you whip out your Magnifying Glass—and you must have one for this—look at the legend. You’ll see a tenth item that isn't listed on your standard blueprints.
It’s labeled Buried Floorplan.
Next to that label is a little number 10. Follow the lines on that map, and you’ll see it pointing directly to a specific curve in the Basement corridors. This isn't just a hint; it's the literal X marks the spot.
The Tools You Need
Don't bother heading there empty-handed. You need two things:
- The Magnifying Glass: To actually see the "10" on the map.
- The Shovel: Because, well, it’s buried.
Some players have reported that a Jackhammer or Power Hammer works too, but the Shovel is the "official" intended tool.
Locating the Dig Spot
Once you’re in the Basement, look for the area where the wall makes a sharp, rounded curvature near the pillars. It’s a bit dark. It’s a bit damp.
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Stand near the rightmost pillar. You might have to wait a second or two for the "dig" icon to actually pop up. I’ve seen people give up because the prompt didn't appear instantly. Be patient. Give it a beat.
Dig it up, and you’ll finally possess the Lost and Found floorplan.
Why You Might Actually Hate This Room
Now, here’s the kicker. Just because you found the blue prince buried floorplan doesn't mean your life just got easier. The Lost and Found is a double-edged sword.
The Perk: It always contains two rare items. This can be a total run-saver if you’re looking for a specific key or a high-tier tool.
The Price: Every single time you step foot in that room, it eats a random item from your inventory.
Basically, the house is "finding" something for you, but it’s taking a tax in return. It’s peak Mount Holly. I’ve heard of players losing their only Skeleton Key just to pick up a useless trophy. It’s a gamble.
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Pro Tip: Use the "Blessing of the Monk." If you draft the Lost and Found as an outer room and end your day while standing inside it, you can grab those two rare items at the very start of your next run when your inventory is empty. No inventory? No tax.
The Puzzle Inside the Lost and Found
Finding the blueprint is only half the battle. Once you actually draft and enter the room, you’re met with a mess of pallet jacks and crates.
It’s a classic "Sokoban" style puzzle. You have to push and pull the jacks to form bridges so you can reach the higher crates. The goal is to hit a glowing green button on the wall.
- The First Bridge: Drag the first jack back so you can slide the one behind it through the gap.
- The Second Bridge: Move the carts until they align. There’s a ramp on the side you’ll need to use.
- The Final Push: You’ll need to align three carts in a row to reach the north side.
Hitting that button doesn't just give you loot; it permanently unlocks a path to the north side of the Reservoir, which is massive for late-game navigation.
Is It Worth the Effort?
Honestly? Yes.
The Lost and Found is one of the eight "Found Floorplans" that are essential if you want to see the true ending of Blue Prince. It adds variety to your drafting pool and gives you a strategic edge, provided you don't let it steal your best gear.
The game is about knowledge. Now that you know exactly where to dig, the basement feels a little less like a tomb and a little more like a treasure hunt.
Next Steps for Your Run:
- Check your inventory for the Shovel before you head down to the basement.
- Make a beeline for the Rotating Gear map to confirm the location for yourself (it helps with the "knowledge" tracking in-game).
- If you find the room too risky, prioritize the Conservatory floorplan instead—it lets you manipulate room rarities, making the Lost and Found’s rare loot less of a necessity.