Difficulty archive
Hard Sudoku
Hard Sudoku offers fewer clues and longer solving chains. These puzzles are still approachable in an MVP setting, but they expect more notes and cleaner logic.
Hard Sudoku #1
Play hard Sudoku puzzle #1 online with notes, timer, and mistake checking.
Hard Sudoku #2
Play hard Sudoku puzzle #2 online with notes, timer, and mistake checking.
Hard Sudoku #3
Play hard Sudoku puzzle #3 online with notes, timer, and mistake checking.
Hard Sudoku #4
Play hard Sudoku puzzle #4 online with notes, timer, and mistake checking.
Hard Sudoku #5
Play hard Sudoku puzzle #5 online with notes, timer, and mistake checking.
Hard Sudoku #6
Play hard Sudoku puzzle #6 online with notes, timer, and mistake checking.
Hard Sudoku #7
Play hard Sudoku puzzle #7 online with notes, timer, and mistake checking.
Hard Sudoku #8
Play hard Sudoku puzzle #8 online with notes, timer, and mistake checking.
Hard Sudoku #9
Play hard Sudoku puzzle #9 online with notes, timer, and mistake checking.
Hard Sudoku #10
Play hard Sudoku puzzle #10 online with notes, timer, and mistake checking.
Hard Sudoku #11
Play hard Sudoku puzzle #11 online with notes, timer, and mistake checking.
Hard Sudoku #12
Play hard Sudoku puzzle #12 online with notes, timer, and mistake checking.
Hard Sudoku #13
Play hard Sudoku puzzle #13 online with notes, timer, and mistake checking.
Hard Sudoku #14
Play hard Sudoku puzzle #14 online with notes, timer, and mistake checking.
Hard Sudoku #15
Play hard Sudoku puzzle #15 online with notes, timer, and mistake checking.
Hard Sudoku #16
Play hard Sudoku puzzle #16 online with notes, timer, and mistake checking.
Hard Sudoku #17
Play hard Sudoku puzzle #17 online with notes, timer, and mistake checking.
Hard Sudoku #18
Play hard Sudoku puzzle #18 online with notes, timer, and mistake checking.
Hard Sudoku #19
Play hard Sudoku puzzle #19 online with notes, timer, and mistake checking.
Hard Sudoku #20
Play hard Sudoku puzzle #20 online with notes, timer, and mistake checking.