Solve the puzzles and find all the hidden objects that you have to use in the rooms in order to advance to the next floor. In this level, you need to repair the elevator control box in order to access the elevator.
7. Signal: Go back to the table. Tap on a four light signal case. Open the case. Insert the battery. Close the cover. The signal light will blink. Notice the number of times each color light blinks: Green (3), Yellow (2), Red (4), Blue (5).