Peter Ritmeester is the inventor of the Hyper Sudoku , where four gray regions also contain 1-9. By applying this idea to a 6x6 sudoku, an entirely new dimension of logic is created, making a Sixy perhaps even more fun than a 9x9 sudoku. Not time consuming hard work, but plenty of logic and insight. Errors are unlikely, with twice as many puzzles (and a six page How-To) in the same amount of space! In a Wacky Sixy few of the regions enclosed by a...
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