How to Play Killer Sudoku

THE PLAYBOOK · ZBZHETONG

How to play Killer Sudoku

Start Killer Sudoku by looking at the playing area and its controls. 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.

Notice the feedback

Watch the feedback after an action. A message can explain whether the input was accepted or whether a rule needs attention. Make the next step deliberately.

Your goal

Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. The feedback beside the game helps you follow the round. Notice how the game responds to your input.

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. Keep the playing area visible while using these controls. Look at the feedback after the action.

A useful example

A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value. Use the example as a guide rather than a substitute for reading your board. Notice the change in the playing area.

Watch out for this

A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction. Read the feedback to see why an action did not have the expected result. Read one step at a time and try it on the playing area. Match the instruction to the control you use.

Common questions