1000 very hard printable sudoku puzzles,Extreme soduku puzzles need some advanced soduku strategies,Such as Uniqueness, Single Digit Patterns,Fish. 1000 Extreme Sudoku is licensed as freeware, full size of the download is 0.54 MB. You can download a free version of 1000 Extreme Sudoku by following download link at Free Downloads section of this page. 1000 Extreme Sudoku is developed or distributed by Sudoku9981.com and is listed under games & entertainment puzzle & word games.