Bertrand emailed to let me know that he's the original creator of one of the Foldapuz puzzles, Yakuso.

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Over on his site, he has a batch of levels available, at varying difficulty levels, as well as a free printable booklet of puzzles to play.

He's given me full permission to continue to use the puzzles, and I've added a link to his site to the bottom of all Yakuso puzzles in the Foldapuz.

Thanks to Bertrand for his wonderful puzzle!