How many movies have Mattis Mathiesen 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 But The Olsen Gang Was Not Dead! (1984). They are most known for their comedy films together.