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About Daily Killer Sudoku

Every level gets one puzzle per day, and everyone plays the same one.

Times without hints go into today's ranking. Puzzles solved on other pages count toward monthly points.

Killer Sudoku rules

Fill the grid so that every row, column and 3x3 box contains 1 to 9 exactly once, just like Sudoku.

The grid is split into cages (dotted outlines). The small number in each cage is the sum of its cells.

A number can't repeat inside a cage.

There are no given numbers. Everything comes from the sums.

Levels

Level	What to expect
Easy	Cages up to 4 cells. Solvable without guessing
Medium	Cages up to 5 cells. Solvable without guessing
Hard	Cages up to 6 cells. Needs deeper reasoning
Expert	Cages up to 7 cells. The hardest level

Cages with only one combination

Memorize these. They are the easiest way into any Killer Sudoku.

Cells	Sum	Must be
2	3	1 + 2
2	4	1 + 3
2	16	7 + 9
2	17	8 + 9
3	6	1 + 2 + 3
3	7	1 + 2 + 4
3	23	6 + 8 + 9
3	24	7 + 8 + 9
4	10	1 + 2 + 3 + 4
4	11	1 + 2 + 3 + 5
4	29	5 + 7 + 8 + 9
4	30	6 + 7 + 8 + 9
5	15	1 + 2 + 3 + 4 + 5
5	16	1 + 2 + 3 + 4 + 6
5	34	4 + 6 + 7 + 8 + 9
5	35	5 + 6 + 7 + 8 + 9
6	21	1 + 2 + 3 + 4 + 5 + 6
6	22	1 + 2 + 3 + 4 + 5 + 7
6	38	3 + 5 + 6 + 7 + 8 + 9
6	39	4 + 5 + 6 + 7 + 8 + 9
7	28	1 + 2 + 3 + 4 + 5 + 6 + 7
7	29	1 + 2 + 3 + 4 + 5 + 6 + 8
7	41	2 + 4 + 5 + 6 + 7 + 8 + 9
7	42	3 + 4 + 5 + 6 + 7 + 8 + 9

FAQ

Is Killer Sudoku harder than Sudoku?

It starts with an empty grid, so it can feel harder at first. With the unique combinations and the rule of 45, Easy and Medium puzzles are very approachable.

Does every puzzle have one solution?

Yes. Each puzzle is checked by a program to have exactly one solution, twice: when it's made and again before it's published.

Do I need to guess?

Not on Easy and Medium: every puzzle there is checked to be solvable without guessing, using cage combinations, the rule of 45 and basic Sudoku logic. Hard and Expert need deeper reasoning.

Is it free?

Yes. Every level is free and unlimited. No sign-up.

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