In each room, there is a square with a rotating gear.
when one of your character is on it, he can spend an Action and rotate the room 1/4 of a turn in the arrow’s direction.
As there are two twin rooms of the same color, he is also capable of rotating the other one, following the arrow in that room, if this one is revealed, of course.
the mekanork has a Special Ability : he can rotate the rooms in either way.
if you play in Secret Forces mode, there can be up to 4 rooms of the same color !