How to Play Killer Sudoku

THE PLAYBOOK · XH0411

How to play Killer Sudoku

Choose Killer Sudoku at XH0411 for a browser session with its rules close at hand. The aim is straightforward: Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. This edition highlights review the result.

8 finite checked puzzles, with local saved progress. No claim of unlimited daily puzzles or calibrated difficulty.

Review the result

When a round finishes, compare what happened with the winning or scoring condition. Use that comparison to choose a better approach next time.

Your goal

Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue.

Step by step

1. Select an editable cell.
2. Enter a value using the keypad or keyboard; Notes stores candidates.
3. Read the region, cage, arrow or outside clues alongside the normal constraints.
4. Check entries verifies the completed board; Undo reverses your last input.
5. New puzzle selects another included puzzle.

Controls

Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game.

A useful example

A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction.

Common questions