This is the forum for helping you out if you're stuck in Grimrock 2 or if you want to discuss about the mysteries of the Isle of Nex. Warning: forum contains spoilers!
Keyhole with a sign that says "shortcut" where do you get the key for this?
and also
SpoilerShow
Top left corner area you to by travelling underwater, the room has a golden key hole under the water and also a locked room with goodies in, any idea where the golden key is for this?