How many movies have Arve Opsahl and Tom Matsen collaborated on?

They have worked on 12 movies together! Their first movie together was The Olsen Gang Takes the Gold (1972) while their highest rated movie together was The Olsen Gang and Dynamite-Harry Goes Wild (1973). They have not worked together since The Olsen Gang's Last Trick (1999). They are most known for their comedy films together.