Varkentje Rund, the animated series that is part of Het Klokhuis, celebrates its 18th birthday this summer. To celebrate this, the pig solves a viewer's problem every week. Clock house viewers aged 8 and older can draw their problem and send it to Het Klokhuis. The adventures of Varkentje Rund are conceived and made by Michiel Hoving, the world's longest-running cartoon series made by one person.

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