1. Go to the left and click the control panel.
2. Enter 4:45 (from the clock in the previous room) to open the door.
3. Go thorough the door and click the cabinet.
4. Do the puzzle to get all green dots in the centre.
5. Open the door to get the gun.
6. Leave the cel and go to the middle cell.
7. Extend your neck so you can get the plunger from the ceiling.
8. Exit the right of the screen and go up the stairs.
Next: The Base Of The Tower