At various points in Zero Escape: Virtue's Last Reward, you will split into groups of three to explore different parts of the mysterious facility you are trapped in. After moving to Floor B of the facility, you can choose to open the Blue Chromatic Door, leading you to the PEC, or Pressure Exchange Chamber, with Clover and Tenmyouji.
Related: Virtue's Last Reward - How To Escape The Elevator
The PEC can be accessed after moving to Floor B and completing at least one of the Floor A areas. This room can be difficult and confusing, so let's take a detailed look at each puzzle in the PEC, and how to escape it.
First, let's understand the layout of the PEC and get a general feel for where things are.
The PEC is separated into two floors, the preparation floor and the exchange chamber. On the top floor, to the right of the entrance, are four lockers. To the left of the entrance door, you can find the safe and a bench with some symbols on it. Sitting on top of the bench is a manual explaining the hazmat suits. Inspecting the manual will also unlock the PEC: Outside file in your archive.
To the left of the bench is another set of four lockers. Beside the lockers is the door you will escape from, and a scanning machine. Near the machine you can find a USB cable and a blue, green, and magenta set of squares. A third set of lockers lies on the other side of this machine.
To move to the bottom floor, you will ride the elevator. On the elevator control system, you can find a glass door with the numbers 25113 printed on it, and a key kept inside. Just below that is a series of symbols that you can change around, with a yellow input button to the right.
On the bottom floor, you can find more lockers, a cardboard box, a barometer, and
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