THE PLAYBOOK · SSNHJ
How to play Killer Sudoku
Choose a round of Killer Sudoku and settle into its rules. Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. Keep the game area visible while you use its controls. Check the rule that explains your first action. Keep the game area visible while you use its controls.
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.
Review a difficult moment
When a decision goes wrong, compare it with the common mistake described below. Start again only when you intend to leave the current round. Keep the objective visible.
Your goal
Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue. Use the instructions to see which actions move you towards it. Notice how the game responds to your input.
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 careful first action helps you become familiar with the layout. 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. Use the example as a guide rather than a substitute for reading your board. 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. Take a moment to reassess the position before continuing. Compare the worked example with your own position. Use the reasoning, not an answer copied from a different board.
Common questions
When I return, what is the goal of Killer Sudoku?
Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue.
While reading the Guide, how do I control Killer Sudoku?
The key detail is this: Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game.
For my first round, what example helps explain Killer Sudoku?
The key detail is this: A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value.
While reading the Guide, what should I watch out for in Killer Sudoku?
A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction.
What format does Killer Sudoku offer?
Keep this in mind: 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.
For this browser game, which play mode does Killer Sudoku use?
Here is the relevant explanation: The mode on this page is Solo. Same-device play uses one screen; this game library does not provide internet matchmaking.