You may now clean out the corridors surrounding the hall. Don't get surprised by the armours in the niches. Find two more gold chalices.

Switch between the axe and an other suitable weapon to defeat the ghost and the Super SS...

...in this room and find a box of plasma gun ammo...

...and in this room and find more health. You now also have a plasma gun.

Exit the house.

Reenter the house through the veranda door. Finish with the ghosts then get the attention of the super guards, use your missile launcher. Break the mirror in the room and get the silver key. Collect more goods including a 1-up.

Exit the house again and reenter it through the main door.

Continue.