Squeeze through the crushed doorway to find the blue keycard, then read each terminal clue before trying the next keypad. Exo Laboratories uses two different number puzzles in the documented early build. This DERELIKT level 4 Exo Laboratories walkthrough follows SplatterCat’s player experience up to the upstairs door.
Find the blue keycard past the crushed door
In the first lab area, one door requires a blue keycard. Look for the crushed doorway you can slip through. In the early build, the reviewer found a dead scientist with the card on the other side. Collect the card and return to the reader to open the blocked door.
The developer’s Exo Labs playtest briefing on Steam describes the section as a mix of combat, ventilation routes, and environmental puzzles. Check your ammunition and look for supplies as you go deeper.
Use the four server towers to open the next door
The reviewer climbed a ladder farther into the lab and found a note that explained the server-tower puzzle. Find the numbers on all four towers and put them in ascending order. In the early build, the resulting code was 1478. Entering it gave the reviewer administrator access.
If you have a different set of rack numbers in front of you, use those. The clue tells you how to order them.
Follow the lead to the worm lab terminal
Later in the preview, the reviewer found a terminal with a downloadable map and a control that lowered a ladder. Read the terminal’s options before leaving. Farther on, an Exo Labs airlock was locked remotely. The survivor upstairs pointed the reviewer to Dr. Krueger’s terminal in the worm lab below.
Look for the message about counting sample tubes. The terminal diagram shows four groups, labeled A through D. The lab controls in the same area let the reviewer open sections to check the specimens.
Count the tubes in A-to-D order
Count the sample tubes in each marked section and enter the four counts in letter order. A supplies the first digit and D the last. Use the diagram to identify the groups before counting. The rule here is different from the server tower puzzle, where you sort the numbers by value.
The reviewer got 8465, told the upstairs survivor the code, and then opened the upstairs door. That door is the end of the route covered here.
FAQ
Where is the blue keycard in the Exo Labs preview?
The reviewer found it on a dead scientist beyond a crushed doorway near the beginning of the lab section.
Why doesn’t 1478 open the upstairs door?
1478 came from sorting the server tower numbers in the early build. The upstairs door takes the sample-tube counts in A-to-D order.
What if my sample-tube count differs from 8465?
Check the terminal diagram and recount each labeled group. The preview terminal describes a code that can change, so use the counts from your own lab.