How to Play Killer Sudoku

THE PLAYBOOK · YINGONG123

How to play Killer Sudoku

Killer Sudoku on YINGONG123 is organised around a clear objective: Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. Begin with explain your choice and use the playbook beside the game.

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.

Explain your choice

Try describing the reason for a move or action in one sentence. If the reason is unclear, revisit the rules before continuing.

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