The Moving City

Climb up the pipe and jump across to the red ladder and continue climbing up so you reach the grey maintenance panel which you then open. Solve the cog motor puzzle that is inside to make the city move. Then make your way down and to bottom far left of the boxes to an orange one that will have a gramophone inside. Take the key from the cupboard and go back outside and towards the red door to the left.

Use the key on the small panel to the right side of the door and solve the circuit board puzzle by matching up all of the pairs of numbers. Then just follow the guides to the right and go through the oval hatch to the next area.