Standard Sudoku rules
Use every digit once in each row, column and 3x3 box.
SudokuIQ puzzle
Play Killer Sudoku online
Solve a free cage-sum puzzle using standard Sudoku rules plus the total shown in each outlined cage. Every puzzle supports notes, hints, coaching and local progress.
Read the cages
Digits inside an outlined cage add to its small corner total and normally do not repeat.
Combine both clues
A cage combination is only valid when it also respects every row, column and box.
How does Killer Sudoku work?
Place 1 to 9 once in every row, column and 3x3 box. Numbers inside each cage must also add up to its displayed total.
Can a number repeat in a cage?
A cage normally does not repeat a digit, which gives you an extra elimination rule alongside standard Sudoku logic.