THE PLAYBOOK · SZHLJS
How to play Killer Sudoku
Start Killer Sudoku in your browser at SZHLJS. Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. The page pairs the game with observe, then act, an example and answers about this edition.
8 finite checked puzzles, with local saved progress. No claim of unlimited daily puzzles or calibrated difficulty.
Observe, then act
Look at the full play area and read the status message. Make a deliberate choice and compare the outcome with your expectation.
Your goal
Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue.
Step by step
- Select an editable cell.
- Enter a value using the keypad or keyboard; Notes stores candidates.
- Read the region, cage, arrow or outside clues alongside the normal constraints.
- Check entries verifies the completed board; Undo reverses your last input.
- 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
What is included in this edition?
8 finite checked puzzles, with local saved progress. No claim of unlimited daily puzzles or calibrated difficulty.
Which controls should I use?
Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game.
Can you show a concrete example?
A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value.
