Pocket Posh Sixy Sudoku Hard: 200 6x6 Puzzles with a Twist

Description

Peter Ritmeester, founder and owner of PZZL.com, is the inventor of Hyper Sudoku where four gray regions also contain 1-9. By applying this idea to 6 x 6 Sudoku, an additional level of logic is created. Pocket Posh Sixy Sudoku Hard Puzzles features a foreword, an extensive how-to-play section, 200 medium to hard puzzles, and complete solutions at the back. The rules: insert the digits 1-6 just once in each a) row, b) column, c) bold outlined area AND d) in each white and gray rectangle.

Peter Ritmeester is founder and owner of PZZL.com and was General Secretary of the World Puzzle Federation (WPF) for twelve years. Books with his sudoku, presented by Will Shortz, have been on the bestseller lists for more than ten years.