Place the OWL CYLINDER (T1) and the DIME (U) in the slots.
Pull the handle (V) to get the OWL COIN.
Return to the Castle lobby.
Place the OWL COIN in the slot (W); take the NUMBER 8 BUTTON (X).
Return to the Elevator.
Place the NUMBER 8 BUTTON in the slot. Press 1875 (Y).
Exit the elevator to reach the Basement.
Take the LONG STICK (A) and GLASS SHARD (B).
Select the boards 4 times (C); go forward to the Sewer.
Go to the Sewer hallway (D).