THE PLAYBOOK · SZHLJS
How to play Killer Sudoku
Read the aim of Killer Sudoku, then make your first move. 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. Make your first input carefully and watch the result. Use the example below to understand a decision.
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.
Make the controls familiar
Locate the buttons and input area before beginning a long round. Use the on-screen labels to avoid an accidental restart. Use the example to check your reasoning.
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. Take a moment to understand the current position.
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. Use the control method described here for this activity. Use one clear input at a time.
A useful example
A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value. Focus on why the action is allowed, not only its outcome. 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. Check the rule before repeating the action. After a move, check what changed. Decide which rule explains the new state before acting again.
Common questions
Before I begin, what is the goal of Killer Sudoku?
The key detail is this: Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue.
Before I begin, how do I control Killer Sudoku?
Keep this in mind: 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?
Keep this in mind: A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value.
For this browser game, what should I watch out for in Killer Sudoku?
Keep this in mind: A full board must obey every extra rule. Reveal supplies assistance; it is not an earned deduction.
While reading the Guide, what format does Killer Sudoku offer?
Here is the relevant explanation: 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.
Before I begin, which play mode does Killer Sudoku use?
The key detail is this: The mode on this page is Solo. Same-device play uses one screen; this game library does not provide internet matchmaking.