As proven by mathmaticians, The fewest clues possible for a proper Sudoku is 17. And here is a collection of 49,151 unique 17-clue puzzles waiting for you! - You can choose to play a random puzzle, or a certain one. All puzzles are numbered, from #1 to #49151. - You can finish a puzzle solely with mouse or solely with keyboard (even number pad), with customizable shortcut keys. - Smart UI designs to minimize your work. Enjoy!