Blood Analyzer Logic Puzzle Solution

The Blood Analyzer puzzles are logic-grid challenges found in the Blood Lab of the underground facility in Chapter 5. Solving them unlocks crafting recipes and useful supplies that help you survive the later chapters.

This guide covers both puzzles, their exact solutions, the required wristband, and the rewards.

Where to Find the Blood Analyzer Puzzles

The Blood Lab is reached in Chapter 5, after descending into the underground facility. It is located past the security checkpoint and before the secure research wing. Look for two terminals with blood samples and a circular grid interface.

Blood Analyzer Puzzle Solutions

Denatured Blood Puzzle

• Input: Click the central node of the blood sample grid.
• Reward: Handgun Ammo + Hemolytic Injector crafting recipe
• Difficulty: Easy

The Denatured Blood puzzle is straightforward. The central node is the only active input, and clicking it solves the puzzle immediately. This is the first Blood Analyzer puzzle you should complete because it gives you a healing recipe.

Reversible Blood Puzzle

• Input: Follow the path Bottom-left → Middle → Top-right → 2nd from top
• Requirement: Level 1 Wristband (found earlier in the facility)
• Reward: Steroids + crafting recipe
• Difficulty: Medium

The Reversible Blood puzzle requires the Level 1 Wristband to access the terminal. The path must be followed in the exact order shown. If you click the wrong node, the puzzle resets and you must try again.

Why These Puzzles Matter

The crafting recipes unlocked here are some of the most valuable in the game:

• Hemolytic Injector: A powerful healing item that restores a large portion of health and can be crafted multiple times.
• Steroids: A permanent maximum health increase. This is one of the best upgrades in the game, especially on Hardcore difficulty.

Missing these puzzles makes the final chapters noticeably harder, so they are recommended for most players.

Blood Lab Rewards Summary

Puzzle	Input	Requirement	Reward
Denatured Blood	Click central node	None	Handgun Ammo + Hemolytic Injector recipe
Reversible Blood	Bottom-left → Middle → Top-right → 2nd from top	Level 1 Wristband	Steroids + recipe

Tips for the Blood Analyzer Puzzles

• Make sure you have the Level 1 Wristband before entering the Blood Lab if you want both rewards.
• The puzzles are optional, but the rewards are highly recommended for all difficulties.
• On Hardcore, the Steroids permanent health boost is especially valuable.
• After solving the puzzles, check the nearby cabinets for extra ammo and healing items.

Common Mistakes

• Missing the Level 1 Wristband and being unable to access the Reversible Blood puzzle.
• Clicking the wrong node in the Reversible Blood puzzle and having to restart the sequence.
• Skipping the Blood Lab entirely and missing the permanent health upgrade.

Next Steps

After solving the Blood Analyzer puzzles, continue through the secure research wing to find the Level 3 Wristband and reach the Elpis Laboratory for the major story branching point in Chapter 5.