trying to do the ritual to get rid of the monster. It seems that I have everything I need but it won't let me put the third stone in for the ritual.It keeps saying that it is full and can't add the last stone.Have any ideas what is wrong.

I have not played the game.
While waiting for someone in the know - check video walkthroughs on Google or check here.

very tough game. I figured out that puzzle. But stuck again looking for artifack

I found another walkthrough here, but it is in German, so you would need to run it through a translator. It is supposed to be a good one.

I finished the game today.A very disappointing ending,unless there is a sequal to this.

According to a review I read, this is supposed to be the first of two parts to the game.