When picked up, players would gain 5 bags of flash powder in their inventory.
There were 2 guards patrolling 2 different paths, and players were required to go through one of these paths to proceed. It was advised NOT to get too close to the guards, as these guards might notice and bring them back to the waiting room (the starting point of the maze). If used successfully, a cutscene would follow showing the player running out and throwing the flash powder at the guard. Once the guard was dazed, players could quickly run through the path being patrolled by the blinded guard.
Flash powder is now unobtainable, however, people who had it in their inventory before the maze got removed still have it.