The premise sounds like a gimmick and turns out to be an engine. You are Simon P. Jones, fourteen years old, and your great-uncle has left you a house called Mount Holly on one condition: find Room 46. The estate has forty-five rooms. The floor plan is a grid, five wide and nine deep, with the entrance hall at the bottom and a sealed antechamber at the top. Forty-five rooms, forty-six needed. That’s the whole hook, delivered in the first sixty seconds, and it takes most players a very long time to work out what kind of question it actually is.

Blue Prince arrived in April 2025 from Dogubomb — essentially Tonda Ros — published by Raw Fury, on PC, PlayStation 5 and Xbox Series consoles. It has been described as a puzzle game, a roguelike, a deduction game and a walking sim, and the reason nobody can settle on a label is that its central mechanic belongs to a genre that doesn’t have a name yet. You don’t explore Mount Holly. Youdraft it.

Drafting as level design

Here’s the loop. Open a door, and rather than a room, you get three blueprints: pick one, and it becomes the room behind that door, permanently for this run. Each blueprint shows its footprint — how many doors it has, and which walls they’re on — plus its cost and any rules attached. Some rooms only place in dead ends. Some cost gems. Some can only appear in the outer columns, or in the back half of the estate. Some are rank-limited, appearing once and never again.

Then you walk in, and the room does something. It might contain a key. It might contain a lever, a note, a shop, a security terminal, a slot for a coin. It might contain nothing except three more doors and three more decisions.

The resource that governs all of it issteps. You start each day with a step budget, every room you enter spends one, and when the steps run out the day ends, the house empties, and tomorrow’s Mount Holly is a fresh sheet of paper. Everything you built is gone.

Set that beside how roguelikes normally work and the difference is sharp. InDead Cells orHades, the run generates a level and you react to it. InBlue Prince the run generatesoptions and you author the level from them, which makes every door a small architectural argument with yourself. Do I take the room with four exits because I need the reach, or the room with one exit because it has a chest in it and I’m nearly out of steps? Do I place the Boiler Room now, knowing it’s cheap and useless, because placing anything else here costs gems I don’t have?

The genius is that the drafting rules are themselves the puzzle. A room that only spawns in dead ends means dead ends have value. A room that must sit on the west wall means the west wall is a resource. Within a few hours you stop seeing a floor plan and start seeing a constraint satisfaction problem with wallpaper. I can think of no other game where the act ofbuilding the dungeon is the intellectual content and the act of walking through it is the reward.

The step economy is the difficulty curve

The elegance of steps as a currency is that it prices everything at once. Curiosity costs steps. Backtracking costs steps. A room that turns out to be a dead end with a locked door costs a step going in and, if you routed badly, several more getting back out. There is no health bar and nothing kills you; the only enemy is the walk itself.

That makesBlue Prince one of the very few games wherelayout efficiency is the skill. Good players don’t have faster reflexes. They have a better sense of the grid — they know that placing a corridor at row three buys them lateral movement for the rest of the day, that a room with doors on three sides at the bottom of the map is worth more than the same room at the top, that spending eight steps on a detour to a shop is only correct if you already have the coins. The difficulty curve is invisible because it’s inside your own planning, and it flattens the moment you get better at reading the grid, which is the most honest kind of progression there is.

The genuine cruelty is that Mount Holly is stingy with the thing you need most, which is reach. Room 46 sits at the top of the grid. Getting there requires an unbroken chain of drafted rooms from the entrance hall to the antechamber, which requires door alignment, which requires luck, which requires that you spend your entire day building a corridor rather than looting one. The house is constantly offering you interesting rooms that lead nowhere and boring rooms that lead north, and choosing correctly means choosing boredom over and over. That’s a real design risk, and the game takes it deliberately.

What actually persists

If the house resets every day, what carries? Two things, and the split is the reason the game works.

The first is a modest layer of permanent unlocks — keys, codes, tools, changes to what can appear in the drafting pool. It’s real, it’s slow, and it’s the least interesting part.

The second isyou. What actually persists across days is the notebook in your head. The house is stuffed with documents: letters, ledgers, memos, a newspaper, plaques, timetables, a set of family records that don’t agree with each other. Read them and a second game emerges underneath the drafting one, made of numbers you can’t use yet, names that mean nothing yet, and rules that turn out to be literal. The most powerful thing you can take out of a run is a fact.

This is the same trickReturn of the Obra Dinn andLorelei and the Laser Eyes run: the gate is knowledge, and knowledge doesn’t reset.Blue Prince welds that to a roguelike’s structural churn, so the randomness that would ruin a fixed puzzle game becomes the delivery mechanism for the clues. A run that ends four rooms short of the antechamber still hands you three documents, and the documents are the actual progress. Once you understand that, the failed days stop feeling like failures. You aren’t trying to reach Room 46 today. You’re trying to learn something today, and Room 46 falls out of enough somethings.

I’d argue the real ancestor is the old cassette-era adventure: the games I typed into a C64 in the eighties where you kept the map on graph paper because the machine wasn’t going to keep it for you, and the memory the game relied on was yours.Blue Prince is that idea rebuilt with a modern designer’s understanding of variance. The graph paper is back. Get a real notebook — the in-game journal does some of the filing, and it doesn’t do the thinking.

Where it fights itself

Two things chafe, and both come from the same source.

Variance can hand you a genuinely dead day. Not a hard day — anothing day, where the drafts come up cheap and doorless, you’re out of gems by row three, and you walk the corridor already knowing there’s no route north. Ten minutes of a game that has no combat and no failure state is ten minutes of walking. The design’s answer is that documents still drop, and the answer holds most of the time. It doesn’t hold all of the time.

And the late game asks a lot. Once you’ve cracked the surface,Blue Prince keeps going — considerably further than most players expect — into puzzles that assume you’ve been transcribing details for thirty hours and cross-referencing them off-screen. That’s not a flaw so much as a filter, and the game is admirably unbothered about who it filters out. It won’t tell you when you’re done. It won’t tell you that you missed something. It just leaves it there.

The verdict

Blue Prince is the rarest thing in games: a mechanic nobody has done before, executed by someone who understood exactly what it was for. The drafting isn’t a delivery system for the puzzle box; the draftingis the puzzle box, and the manor is the physical form of a decision tree. It is also gentle, funny, beautifully lit, and quietly sad about the family it’s describing — a game that could have been a pure abstraction and chose to be a house instead.

The step economy will frustrate anyone who wants a puzzle game to sit still and be solved. Everyone else gets forty hours of the specific, disreputable joy of realising that a note you skimmed on day six was an instruction. Play it on PC if you want the notebook open on a second screen; the console versions play identically and you’ll just want paper instead.

If it lands, go toLorelei and the Laser Eyes next for the same respect for your attention, orAnimal Well for the same conviction that the real progression happens in your head.

Spoilers below

The moment the game shows its hand is when you realise the forty-five-room count was never the constraint. Mount Holly’s grid has edges, and the game spends its opening hours training you to treat those edges as walls. They are not. Once the estate proves it can extend past its own footprint, the drafting rules you’d internalised as physics turn out to be conventions, and every “impossible” placement you’d written off becomes a question again.

That’s the structural rhyme with the story. The house is a document about a family that lied about its own shape — an inheritance built on a boundary that was drawn wrong on purpose. Simon is handed a floor plan and a puzzle, and the puzzle is that the floor plan is a claim, not a fact. Learning to distrust the grid and learning to distrust the paperwork are the same act, arriving at the same time, which is about as tight as a game and its theme ever get.