Place the SPECIAL CRYSTAL on the cube; take the CRYSTAL CUBE and the JEWELER'S BOX (Q).
The CRYSTAL CUBE and the JEWELER'S BOX are now in your menu bar.
Use the CRYSTAL CUBE on the window to earn the CHARGED CRYSTAL (BLUE) (R).
Select the JEWELER'S BOX (S).
Drag the correct materials over the blueprint (A).
Drag the MALACHITE to the center (B).
Drag the PLUMBUM to the 4 arms (green).
Select the BLUE CRYSTAL (C), and push the 'Create' button (D).
Take the MALTESE CROSS (E).
Use the MALTESE CROSS in the lock (F).
Walk forward to the Main Square.