Sudoku
HomeEach number once in every row, column and bold box.
Each number once in every row, column and bold box.
Fill each row, column and bold box with every number once. Play standalone Sudoku without patches or queen constraints.
This example row already contains 1, 2, 3, 4, 6, 7, 8 and 9, so its empty square needs 5. Before entering it, check that 5 is also absent from the square’s column and bold 3×3 box. A number must satisfy all three groups; a locally legal entry is not necessarily the final solution.
9×9 uses 3×3 boxes, 16×16 uses 4×4 boxes, and 32×32 uses 4×8 boxes. Large boards include a full map and an enlarged input window. The 10,000-puzzle count includes geometric variants, not 10,000 hand-authored designs.
Use the numbers 1 through 16, each once in every row, column and bold 4×4 box. HuddleJoy uses decimal numbers, not hexadecimal letters A–F. Open Puzzles & help to choose the 16×16 journey, then select the part of the full-board map you want to work on.
Each box is four rows high and eight columns wide, containing 32 squares. Fill every row, column and box with 1 through 32 exactly once. The full map gives you context while the enlarged window keeps individual squares and the number controls readable.
Use Erase or Undo to revise entered numbers; gold underlined starting clues stay fixed. Hints highlight a suggested square and value. Wait for Saved before leaving. Guest progress belongs to this browser’s private cookie; clearing it can remove access. A confirmed account supports account saves when selected.