Classic 9x9 sudoku at medium difficulty — 27 clues given, 54 cells to fill in. A balanced clue count for players comfortable with the basics.
This preset locks the difficulty to medium, which starts each puzzle with 27 clues (the generator removes 54 of the 81 cells from a completed, valid 9x9 grid). A balanced clue count for players comfortable with the basics. Every puzzle has exactly one solution. Solve it on screen or download a print-ready PDF with an optional answer key.