Denksport Sudoku Kampioen 3-4* puzzle book

Denksport is the leading brand for puzzle books in the Netherlands and Belgium. Its history dates back to 1930 when the first puzzle magazine was published, following the massive popularization of crosswords. The brand was originally established in Amsterdam by a collaboration between a journalist and a publisher.

Over the decades, Denksport evolved into the primary name for brain games, eventually becoming part of Keesing Media Group. The products are primarily printed and distributed within the Netherlands, catering to a vast audience ranging from beginners to advanced puzzle enthusiasts. In the present day, the brand is owned by the Swedish-based investment firm Egeria through its majority stake in Keesing Media Group, ensuring that while the brand remains quintessentially Dutch in origin, its corporate oversight is part of a larger European media network.