Sudoku with cages and sums: arithmetic and logic on every page.
Killer Sudoku keeps every rule of classic Sudoku and adds one more. The grid is divided into outlined cages, each with a small total in its corner, and the numbers in a cage must add up to that total with no number repeated. Many Killer Sudoku start with very few printed numbers, or none at all, so the cages do most of the work.
That's what makes it so absorbing: arithmetic and logic on every move. A two-square cage totalling 3 can only hold 1 and 2. A cage of 17 across two squares must be 8 and 9. Learn the common combinations, add the classic Sudoku techniques, and you'll start to see whole regions fall into place. Experienced solvers also use the fact that every row, column and 3x3 box adds up to 45 to work out squares the cages leave open.
We publish three Killer Sudoku series. 1000+ Killer Sudoku Variants is the big one: more than 1,000 puzzles per book on 8x8, 9x9, 10x10 and 12x12 grids, plus Killer X and Killer Windoku, in three rising levels. 157 Large Print Killer Sudoku prints one puzzle per page with cage totals you can read at a glance, in Novice, Adept and Master editions. 240 Pocket Killer Sudoku puts 240 puzzles in a compact book for journeys and holidays, in four levels including Easy to Extreme.
If you're new to Killer Sudoku, start with an Easy to Hard or Novice book and keep a list of cage combinations to hand. If you already solve hard classic Sudoku, the Medium to Very Hard and Hard to Extreme books will give you a proper workout.
Each series page below explains what's inside, the levels on offer and who the books suit, so you can compare them and pick the right one. If you enjoy the mix of sums and logic, you may also like Calcudoku, which uses all four operations, and Kakuro, the crossword of numbers.
Six kinds of Killer Sudoku, 1,000+ puzzles.
Killer Sudoku on 8x8, 9x9, 10x10 and 12x12 grids, plus Killer X and Killer Windoku. Every cage must add up to its total with no repeats: arithmetic and logic together, with variety to last for months.
Killer Sudoku printed large, one per page.
All the sums-and-logic challenge of Killer Sudoku, with cage totals you can read at a glance. One puzzle per page, in three levels from Novice to Master.
Killer Sudoku to go.
240 Killer Sudoku in a compact, travel-friendly size: cages, sums and logic wherever you are. Choose your level, or take Easy to Extreme for a bit of everything.
The grid follows the same rules: every row, column and box holds each number once. Killer Sudoku adds cages, and the numbers in each cage must add up to its total without repeating. Because the cages carry the clues, there are usually few or no numbers printed in the grid.
No. In Killer Sudoku every number in a cage must be different. That's one of the main differences from Calcudoku, where a number can repeat inside a cage as long as the copies aren't in the same row or column.
They're Killer Sudoku with an extra rule from two popular Sudoku variants. In Killer X, the two long diagonals must also hold each number once. In Killer Windoku, four extra shaded boxes must do the same. Both appear in 1000+ Killer Sudoku Variants.
Choose 1000+ Killer Sudoku Variants Easy to Hard for the most puzzles and variety, or 157 Large Print Killer Sudoku Novice if you'd like big, clear grids. Both start gently and build up.
