How many movies have Anja van Mensel and Walter de Donder collaborated on?

They have worked on 7 movies together! Their first movie together was Plop and the Violin Adventure (2005) while their highest rated movie together was 10 jaar Plop - Kabouter Plop (2007). They have not worked together since Plop Becomes Gnome King (2012). They are most known for their adventure films together.