Submachine 4: The Lab is the fourth installment of the popular Submachine Flash Puzzle/Adventure game. Created by Mateusz Skutnik, Submachine is a compelling mystery that only gets more intriguing as time goes on. Scraps of paper, words etched into walls, and archaic computers leave clues as to what the Submachine is, and how you must escape it. All of the (so far) 5 Submachine games tie into one another, and references to previous ones are riddled throughout.