Peter Ritmeester

Puzzle constructor, CEO of PZZL.com, and General Secretary of the World Puzzle Federation (WPF) for twelve years. HIs puzzles have been published in 500+ books, The New York Times, on the cover of Games Magazine, and 100+ other media on all continents except Antarctica.

Ritmeester is the inventor of both Hyper Sudoku and Sixy Sudoku.

His books in English and a short bio: www.amazon.com/author/peterritmeester

His books in Dutch: www.pzzl.com

A free app with 500 Sixy Sudoku: www.sixysudoku.com