Industrial Labyrinth Complete Guide
Code 21323 Solution, Laser Room, Numbered Doors, Portal Corridor & Step-by-Step Walkthrough
Last updated: 2026-02-24
Complete walkthrough for Arknights Endfield's Industrial Labyrinth Protocol Space puzzle from Delver of the Cryptic. Learn the code 21323 door sequence (2-1-3-2-3), navigate the laser room using the yellow portrait landmark, choose correct numbered doors, traverse the portal corridor by going right, and find the final exit. Includes 8 detailed screenshots, step-by-step instructions, FAQ, and interactive checklist for this permanent Protocol Space challenge.
Step 1: Remember Code 21323
At the beginning of the Industrial Labyrinth, you'll see a large glowing code displayed on the wall: 21323. This is the key to solving the entire puzzle.
The code 21323 displayed at the starting area
What This Code Means
The code 21323 tells you the order of doors to choose: 2 → 1 → 3 → 2 → 3. Each number corresponds to a numbered door you'll encounter in sequence throughout the labyrinth.
Step 2: First Chest Room
After memorizing the code, you'll enter a room with a chest. This is an important landmark for finding the correct path forward.
When you see the chest in front of you, the door is directly on the LEFT
The Solution: When you see the chest positioned in front of you, look to your LEFT. The door you need to enter is directly on the left side of the chest. Enter that door to proceed to the laser room.
Remember This
The chest is a visual marker. Don't get distracted by it - focus on finding the door to the left of the chest to continue your journey through the labyrinth.
Step 3: Laser Room Navigation
After the chest room, you'll enter a room with red laser beams crossing the space. This is an obstacle room - you need to navigate through it carefully to reach the correct exit.
The laser room - look for the yellow portrait in the corner
The Solution: Look around the room for a corner with a yellow portrait or sign on the wall. The correct door to proceed is located in that corner. Navigate through the lasers to reach it.
Pro Tip
The lasers deal damage if you touch them, so move carefully. Look for safe paths between the beams or time your movements if they move in patterns.
Step 4: Numbered Doors - Follow 21323
After the laser room, you'll encounter a series of rooms with numbered doors. Using the code from Step 1 (21323), choose doors in this exact sequence:
Numbered doors - enter door 2 first, then you'll see door 1 inside
Door Sequence
- 1st door: Choose door with number 2
- 2nd door: Choose door with number 1
- 3rd door: Choose door with number 3
- 4th door: Choose door with number 2
- 5th door: Choose door with number 3
Remember
Each door choice leads to a new room with more doors. Continue following the sequence 2-1-3-2-3 until you've gone through all five numbered choices.
After the Fifth Door
Once you've completed the 2-1-3-2-3 sequence, you'll enter a hallway. The final "3" door won't be explicitly shown, but you'll know you're at the right place when you see the path directly ahead with number 1 on the right wall as confirmation.
After completing the 21323 sequence, go straight ahead - number 1 on the right confirms the path
The Solution: After the final "3" in the sequence, you'll enter a hallway. Go straight through the door directly in front of you. Look for the number 1 displayed on the right wall - this confirms you're on the correct path to the portal section.
Step 5: Portal Corridor
After completing the numbered doors sequence, you'll reach a corridor with portals. This section requires you to navigate through multiple portals to reach the final chest.
The portal corridor - go directly to the RIGHT and keep entering portals
The Solution: When you reach this corridor, go directly to the RIGHT. You'll find portals - keep entering them until you reach the final chest.
The final chest you'll reach after going through the portals
Continue entering portals until you find the final chest. Once you've collected it, you can proceed to the final exit corridor.
Portal Navigation
The portals may transport you to different areas. Keep going right and entering portals until you see the final chest. Don't worry if it takes a few portal jumps - that's normal!
Step 6: Long Corridor Exit
After collecting the final chest from the portal section, you'll reach the long corridor. This is the final section before completing the Industrial Labyrinth.
The long corridor - go to the end and choose the door on the RIGHT without portals
The Solution: Walk to the end of the corridor. Then choose the door on the RIGHT side that has no portals. This is the correct exit to complete the challenge.
Important
Make sure to choose the door WITHOUT portals. Some doors may have portal effects - avoid those and pick the plain door on the right at the end of the corridor.