How to Play Killer Sudoku

THE PLAYBOOK · SZNTHZB

How to play Killer Sudoku

Try Killer Sudoku at your own pace and keep its objective in view. Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. Use the example below to understand a decision. Read the objective before making your first input. Check the relevant rule before repeating a move.

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.

Try a deliberate move

After a move, check what changed. Decide which rule explains the new state before acting again. Refer to the controls when needed.

Your goal

Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. An attractive position is not enough unless the goal is met. Follow this game’s rules rather than another version’s.

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. Use the control method described here for this activity. Read the example below alongside these instructions.

A useful example

A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value. Apply the same reasoning to the position in your own round. Keep the controls nearby.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction. A different version of the game may use a different rule. Keep the stated aim separate from side details such as animation or appearance. Progress is measured by the game’s own completion or scoring rules.

Common questions