Sudoku for Kids: Learn the Rules With a 4×4 Example
Start Sudoku by filling each empty cell without repeating a digit in its row, column or bold-lined box. A 4×4 board uses 1–4, a 6×6 uses 1–6 and a classic 9×9 uses 1–9.
How do you start a Sudoku puzzle?
Start Sudoku by filling each empty cell without repeating a digit in its row, column or bold-lined box. A 4×4 board uses 1–4, a 6×6 uses 1–6 and a classic 9×9 uses 1–9.
Try a 4×4, 6×6, or 9×9 Sudoku board
A first 4×4 example: find the missing digit
Read the top row: 1, blank, 3, 4. A 4×4 row needs every digit from 1 through 4 once. Only 2 is missing, so the highlighted cell must be 2. Now check its column: 4, 1, and 3 are already there, so 2 fits. Its top-left 2×2 box also has no 2.
All three checks matter. A digit that seems to fit the row can still conflict with its column or box. Ask the learner to say which numbers are ruled out before entering a final digit. If two possibilities remain, move to a different cell or record both as notes.
Pencil notes are possibilities, not answers
Turn on Pencil notes and select an empty square to record candidate digits. Notes do not count as a filled answer. Turn notes off when the reasoning leaves one definite value. Erase removes the selected entry or notes. Undo restores the previous edit, which is useful when a child taps the wrong square.
A common beginner mistake is to treat a note as a solved cell. Another is to use a blank-looking cell that already holds a note without checking its row and column. Re-read the candidates after each definite placement: a new digit elsewhere can rule out an old possibility.
What does a logical hint do?
In ZogMath, a logical hint first points to an incorrect entry that needs another look. If the current entries are correct, it finds a cell with only one possible digit and fills it. If no such cell is available, it lists candidates instead of inventing a deduction. The page counts assisted placements.
Sudoku here is a solo puzzle. The hint system helps you reason and the checker detects rule conflicts; neither is a computer opponent racing to fill the same board. After using a hint, explain why its digit fits the row, column, and box before continuing.
When should a learner move to a larger board?
Stay on 4×4 until the learner can explain several placements. A 6×6 board keeps the same rule but introduces rectangular 2×3 boxes. A 9×9 board has more cells and candidates, so it requires more scanning and note management. Board size changes the task; it is not an age test or a guarantee of difficulty.
Choose Daily for a puzzle that stays fixed for the date. Retry keeps that puzzle. Choose Practice or Next practice puzzle for a new one. Each generated board is checked for one solution. Start with a few explained moves and stop before guessing becomes the main strategy.
Do diagonals or row totals matter?
Classic Sudoku does not require unique diagonals or a target row sum. Those belong to other puzzle variants. For this game, check only the row, column, bold box, and the fixed clue digits. Red marks indicate duplicates; a filled board must satisfy all constraints.