The Dink Network

Im stuck where you get the key to get into the castle/tower I take the key and then it says this is the key to the tower!
so I go to the front door of the tower and the key doesnt open the door!!
It says the same message this is the key to the tower!

I think there's a gold brick there which is the "keyhole". Try both ctrl and space.

thanks for the help appreciated!!

Can you help me with the underground dynamite!! cant blow it up