Resident Evil Requiem: Blood Analyzer Puzzle Solutions Guide

Why the Blood Analyzer Puzzles Matter (and How I Messed Them Up First)

After spending my first run of Resident Evil Requiem hoarding gunpowder and fluids “for later”, I finally realized the real bottleneck wasn’t materials at all – it was the blood analyzer puzzles in Rhodes Hill. Until you solve them, Grace can’t actually craft some of her most useful ammo and injectors, no matter how much junk you’ve looted.

I burned a good 30-40 minutes randomly poking nodes, constantly hitting the move limit and resetting. The breakthrough came when I stopped brute-forcing and treated them like strict, minimal-move logic puzzles. Once I nailed the exact click orders, I could clear all three main specimens – Denatured, Reversible, and Converged – in under five minutes total on subsequent runs.

This guide walks you through:

• Where to find each blood specimen in Rhodes Hill
• What access you need (wristbands, doors, etc.)
• The exact node activation sequence for every puzzle
• What crafting recipes each specimen unlocks for Grace
• A quick note on the Insanity-only fourth puzzle

If you follow these steps, you’ll unlock Handgun Ammo, Hemolytic Injector, Steroids, Stabilizers, Med Injector, and 12.7x55mm ammo recipes with almost no trial and error.

How the Blood Analyzer Puzzles Work

All of the blood analyzer puzzles share the same core rules. Understanding them makes the specific solutions below much easier to follow.

• The analyzer shows a small network (grid) of “nodes”.
• Square (or cube) nodes are the ones you can click.
• Circle (or sphere) nodes are the “correct” final state you’re aiming for.
• Clicking a square node flips that node and every node it’s directly connected to (square ↔ circle).
• Each specimen has a strict minimum number of moves. If you exceed it, the puzzle hard-resets.
• You can manually reset at any time using the on-screen reset prompt before wasting moves.

All of my directions assume you’re standing in front of the analyzer, looking straight at the grid. When I say things like “top-middle” or “bottom-left”, I’m talking about the grid from your perspective at that screen.

With that out of the way, let’s go specimen by specimen.

Puzzle #1 – Denatured Specimen (Purple)

Location and Access

The Denatured blood specimen is your tutorial puzzle for the analyzer.

• Area: Blood Lab in Rhodes Hill
• Where: On the desk immediately to the right of the blood analyzer
• When: First time you reach the Blood Lab (no special wristband required)

Pick up the purple specimen, interact with the analyzer, and select the Denatured sample to start.

Exact Solution (1 Move)

This is the easiest one in the game – and also where I overthought things and tried to “set up” a combo that doesn’t exist.

The Denatured grid is very simple: a short line of connected nodes. You only have one move, so you can’t experiment much.

• Step 1: Click the middle square node in the cluster. It’s the square that sits between two other nodes in the chain.

That single click should convert every node in the structure to circles and immediately complete the analysis.

Rewards and Why You Want Them Early

• Handgun Ammo crafting recipe
• Hemolytic Injector crafting recipe

Unlocking handgun ammo crafting right here changes how aggressive you can be for the rest of Rhodes Hill. The Hemolytic Injector gives you another reliable heal you can dump spare components into instead of letting them clog your inventory.

Puzzle #2 – Reversible Specimen (White)

Location, Access, and Nearby Pickup

This is the one that tripped me up the most – not just the puzzle, but actually reaching it efficiently.

• Area: Side room attached to the Blood Lab
• Door: Locked with a Level 1 ID wristband
• Specimen: White blood sample on a piece of equipment in the back corner
• Don’t miss: There’s also an Empty Injector on a shelf in this room – grab it while you’re here.

As soon as you’ve got Level 1 clearance, come straight back to this door from the main Blood Lab and clear this puzzle. The rewards are too good to delay.

Understanding the Grid Layout

The Reversible specimen uses a denser network than Denatured. Different guides online label this grid in slightly different ways, which is what confused me at first. In my game (Standard and Hardcore), the layout behaves like a rough 3×3 cluster with a few extra connections.

To keep things clear, I’ll refer to the grid as a 3×3 from your point of view:

• Top row: Top-left, top-middle, top-right
• Middle row: Middle-left, middle, middle-right
• Bottom row: Bottom-left, bottom-middle, bottom-right

You can only click square nodes – some of these positions might start as circles and won’t be clickable.

Exact Solution (4 Moves)

Reversible gives you four moves. Here’s the exact sequence that consistently solved it for me on multiple playthroughs:

• Step 1: Click the bottom-left square node.
• Step 2: Click the center (middle) square node.
• Step 3: Click the top-right square node.
• Step 4: Click the node directly below top-right (that’s the middle-right position).

After the fourth click, every node in the structure should be a circle, and the analyzer will confirm completion.

Don’t worry if some of those positions start as circles – you’re still targeting those positions, as long as they’re square-shaped and clickable when it’s their turn. If you mis-click or lose track, hit the reset prompt and start the four-step sequence again; going over four moves just forces an automatic reset anyway.

If Your Reversible Layout Looks Different

I’ve noticed that after certain patches and on different difficulty modes, the initial on/off pattern can look slightly different, even though the structure is the same. Two quick checks if the above doesn’t seem to work for you:

• Make sure you’re counting rows from the top of the grid, not from the bottom.
• Only click nodes that are square/cube-shaped on their turn; if a position is a circle when you get to that step, your earlier clicks are out of sync – reset and start over.

So far, this sequence has solved the Reversible puzzle for me on every run on Standard and Hardcore. If Capcom ever fully redesigns the layout in a patch, check updated visuals, but for launch versions this pattern is reliable.

Rewards – Huge Mid-Game Power Boost

• Steroids crafting recipe
• Stabilizers crafting recipe

These are some of the best long-term items you can get for Grace in Rhodes Hill. Steroids and Stabilizers function as powerful upgrades and support items, letting you turn spare components into long-lasting advantages instead of basic heals. This is why I always backtrack here as soon as I have the Level 1 wristband.

Puzzle #3 – Converged Specimen (Green)

Location and Access

The Converged specimen is easy to miss if you rush past the Waiting Room area, but it’s available fairly early.

• Area: Waiting Room in Rhodes Hill
• Door: Level 1 door lock leading to a small Closet
• Specimen: Green blood sample on the desk inside the Closet

You need the same Level 1 clearance wristband you used for the Blood Lab side room. Once you have it, unlock the Closet from the Waiting Room, grab the green Converged specimen, then bring it back to the analyzer.

Exact Solution (2 Moves)

Converged has a vertically-stacked feel to its layout. Think of it as a column running down the middle of the grid.

• Step 1: Click the top-middle square node (top of the central column).
• Step 2: Click the bottom-middle square node (bottom of that same central column).

Those two clicks are all you need. Every node in the structure should flip to circles, and the analyzer will finish the Converged analysis.

Rewards – High-Power Tools

• Med Injector crafting recipe
• 12.7x55mm ammo crafting recipe

Med Injectors give you a stronger, more flexible healing option for tougher encounters, and 12.7x55mm ammo is your ticket to keeping heavier weapons fed later in Rhodes Hill and beyond. If you like to carry a “panic button” gun for big threats, this ammo recipe is crucial.

Bonus – The Polymerized Specimen on Insanity (Optional)

If you’re playing on Insanity difficulty, there’s a fourth analyzer puzzle tied to a Polymerized specimen later in the game, found around the archives/records area on a second analyzer setup.

The layout is a bit different, but the same rules apply. The working sequence I used:

• Step 1: Click the middle-left square node.
• Step 2: Click the middle-right square node.
• Step 3: Click the bottom-middle square node.

This is a three-move puzzle and unlocks an additional high-end crafting recipe. It’s not relevant to a standard first playthrough, but if you’re aiming for full completion on Insanity, it’s worth knocking out once you reach that part of the game.

Common Mistakes and Time-Saving Tips

Having stumbled through these myself, here are a few things that will save you some frustration:

• Don’t click circles. Only squares are interactable. If you find yourself jamming on circles, you’re probably misreading the layout.
• Respect the move limit. If you know a puzzle is 1, 2, or 4 moves, and you’ve already “wasted” one, just reset immediately instead of trying to salvage it.
• Stand directly in front of the screen. Angled camera positions can make it harder to tell which node is “top-middle” or “bottom-left”. Center yourself before starting.
• Grab nearby loot in the same trip. When you open the Level 1 doors (Blood Lab side room, Waiting Room Closet), sweep the whole room: files, injectors, ammo. I used to bee-line only for the specimen and missed helpful items.
• Complete all three as soon as possible. The earlier you unlock these recipes, the more value you get from every scrap of crafting material you pick up afterward.

What to Do After Unlocking All Analyzer Recipes

Once Denatured, Reversible, and Converged are all analyzed and you’ve got your six core recipes unlocked, Grace’s progression in Rhodes Hill opens up a lot:

• Start actually spending gunpowder and reagents on Handgun Ammo and injectors instead of hoarding them.
• Invest in Steroids and Stabilizers when you have spare components for permanent or long-term benefits.
• Plan ahead for heavy fights by crafting Med Injectors and 12.7x55mm ammo before you push main objectives.
• Shift your exploration focus to other progression items like Antique Coins and Mr. Raccoon collectibles, knowing your core crafting is set.

On my second playthrough, doing these puzzles as soon as I reached each area made the whole Rhodes Hill section feel completely different – I wasn’t limping from save room to save room anymore. Instead, I had the freedom to take fights on my own terms, because I could top up ammo and healing whenever I needed, as long as I kept looting.

If you follow the exact node orders above, you’ll have all of Grace’s key blood-analyzer recipes unlocked in a single short stretch of play. From there, the real challenge isn’t the puzzles – it’s what you choose to craft with your new options.