THE PLAYBOOK · DOORSL
Read before your next round of 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. Check the relevant rule before repeating a move. Choose a comfortable screen position before beginning. 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.
Practice with a purpose
Watch the feedback after an action. A message can explain whether the input was accepted or whether a rule needs attention. Refer to the controls when needed.
What counts as success
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.
A walkthrough of the rules
- 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.
Input guidance
Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game. On a smaller screen, keep the active part of the board within view. Read the example below alongside these instructions.
Follow the 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. Look for the relevant detail.
A common point of confusion
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. When a decision goes wrong, compare it with the common mistake described below. Start again only when you intend to leave the current round.
Helpful answers for players
While reading the Guide, what is the goal of Killer Sudoku?
For clarity: Fill rows, columns and boxes with 1–9 once. Cage digits cannot repeat and must add to their clue.
On this playing page, how do I control Killer Sudoku?
Click or tap cells and the digit pad. Use Notes, Undo and Reveal selected. Large boards scroll inside the game.
While reading the Guide, what example helps explain Killer Sudoku?
A two-cell cage labelled 3 holds 1 and 2; a one-cell cage fixes its own value.
When I return, 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.
For a quick reminder, what format does Killer Sudoku offer?
The key detail is this: 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.
While reading the Guide, which play mode does Killer Sudoku use?
Keep this in mind: The mode on this page is Solo. Same-device play uses one screen; this game library does not provide internet matchmaking.