How to Play Killer Sudoku

THE PLAYBOOK · SLTPPF

How to play Killer Sudoku

The SLTPPF guide to Killer Sudoku starts with control confidence. Your task is to fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. Use the controls below and follow the example to get started.

This collection contains 8 puzzles. Progress is saved in this browser. The same puzzle can appear again; the collection is not labelled with calibrated difficulty levels.

Control confidence

Check the controls before starting. On a touch screen, keep the game area visible and use the labelled buttons where they are provided.

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