Time Lock takes place in a double-height room in the Processing Wing area, with a game area on the lower level with a ramp around the wall leading up to a higher platform. Three large tanks hang from the ceiling within reach of the upper platform, with their pipes leading down into a booth with the game's nominee locked inside. The tanks are set to open when the timers on them expire.

The other three members of the team have to follow a set of clues starting from three hints on the central monitor, which lead them each around a chain of controls and puzzles similar to Treasure Hunt. This finishes with them getting a key to remove the timer mechanism from one of the tanks - they have to unlock a valve on the tank and spin it to take out the timer, which has an actuator inside that will push the button to release the gunge if it's still attached to the tank when the game ends.

It has the honour of being the only game to have had a loophole exploited in it - in its appearance in Industrial Zone 5, Yasa realized that instead of completing a puzzle to release a key from a chain, they could lift up the battery-powered console and take the entire thing to the tank instead.

Time Lock was entirely inspired by an amazing Industrial Zone-themed drawing by DF - the game was written around the appearance of the huge gunge machine.