Grimrock

Allrighty well I got what I assume to be the "Bad Ending." Anyone can let me know where the last alter is? Thanks!

How'd you get into the castle?

I have the four orbs placed, yet the hooded Mage only peers through the slit in the door then closes it. Nothing happens.

Can someone please post the correct order (or just which altars) in which items are placed on the altar in the "Room of Offerings". I'm stuck and would love a reply. Can't seem to get to the switch no matter what altars I place items on. Many thanks!