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Four grid sizes 9x9, 8x8, 6x6, 4x4 Print any puzzle, along with its solution Email puzzles to your friends and family* Solve puzzles from any source** Reveal possible numbers Highlight wrongly entered numbers Graded puzzles, from Easy to Devilish Timer to help you set your pace Panic button for when the boss appears! High score table, Save game feature and Number or letter puzzles