Which site of GB should I be on to ask questions about some of the free games ? in particular Old Castle

Boolie,

If it is a Casual game - here at Casuals.

If it is adventure - at Adventure discussion forums or Adventure Hints forum.

If it is action or RPG - at Darkside forum.

I also will move you to a separated thread so as not to mix it here at Return to Ravenhearts thread.

From what I read - I think Old Castle is an adventure game.