Little Killer Sudoku
Clues outside the grid give the sum of a diagonal
Little Killer Sudoku is fully playable. Choose a difficulty and start solving.
Arrows outside the grid announce the sum of every cell along their diagonal — and unlike cage-based cousins, digits along a diagonal may repeat. Short diagonals with extreme totals are the entry points. Sum enumeration with a twist that trips up cage veterans.
For the complete rules, worked examples and solving techniques, read the full How to Play Little Killer Sudoku guide.
Like all Sudoku variants, Little Killer Sudoku builds on the classic 9×9 foundation. Every row, column, and 3×3 box must contain each digit from 1 to 9 exactly once. The variant constraint is added on top of these standard rules, never replacing them.
If you're new to Sudoku, start by learning the basic rules and techniques before attempting variants.
Techniques Useful for This Variant
| Technique | How it applies |
|---|---|
| Pencil Marks / Notes | Essential for tracking candidates alongside the variant constraint |
| Obvious Singles | Cells narrowed to one candidate by the combined constraints |
| Hidden Singles | Digits with only one valid cell in a unit after variant elimination |
| Pairs and Triples | Locked candidates exposed by the additional constraint |