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Games · Logic · 10–20 min
Sudoku+
Fill the grid so every required group contains the digits 1–9 exactly once.
Diagonal No. 3 · DifficultyTricky
Some steps need more advanced patterns, such as candidate triples or an X-wing. This label is provisional: it reflects the solving techniques the puzzle needs, not how many digits are given.
How to play
- Every row, column and 3 × 3 box holds the digits 1–9 exactly once.
- Diagonal rule: both long diagonals, corner to corner, must also hold 1–9 exactly once. They are hatched on the board.
- Select a cell, then use the number chest or your keyboard. Given digits are fixed.
- Notes are pencil marks. A digit that repeats in a row, column or box is flagged straight away, and Hint reveals one correct digit.
Hatched cells are the two long diagonals. Each must hold 1–9 once, as well as every row, column and box.
Keyboard: arrow keys move, 1–9 enter a digit, N toggles notes, Backspace erases, Ctrl+Z undoes.