How to Play Little Killer Sudoku

Clues outside the grid give the sum of a diagonal

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The Rules

Standard Sudoku rules apply: fill every row, column, and 3×3 box with the digits 1–9, each appearing exactly once.

Little Killer Sudoku places clues outside the grid along with a diagonal arrow. The arrow points to a diagonal stripe of cells, and the clue gives the sum of all digits along that diagonal. Unlike standard Killer Sudoku cages, digits CAN repeat on Little Killer diagonals as long as they don't violate the row/column/box rules. This makes the arithmetic different from standard cage solving.

At a Glance

0–6 given digits
Typical givens
Outside Clues
Constraint type
~14m
Easy solve time
~28m
Medium solve time

How to Solve Little Killer Sudoku

Beginner
Diagonal Enumeration
For each clue, enumerate all combinations of N digits (allowing repeats, 1–9) that sum to the clue value.
Beginner
Repeating Digits Allowed
Unlike Killer cages, Little Killer diagonals can repeat digits as long as standard row/column/box uniqueness is preserved.
Intermediate
Short Diagonal Logic
A 1-cell diagonal directly gives that cell's digit. A 2-cell diagonal with clue C has limited pairs — enumerate them immediately.
Advanced
Cross-Diagonal Intersection
When two diagonals share a cell, the shared cell must satisfy both sum constraints simultaneously.
Intermediate
Row/Column Interaction
A diagonal cell belongs to a row, column, and box — combine Little Killer sum constraints with standard uniqueness rules.
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Common Questions

What is a 'diagonal' here? ▾

A Little Killer diagonal is a sequence of cells running diagonally from an outside arrow clue, in the direction indicated by the arrow.

Can the sum repeat any digit? ▾

Yes — digits can repeat on a Little Killer diagonal, unlike Killer cages.

Are given digits provided inside the grid? ▾

Some puzzles include a few given digits; others provide only the outside clues.

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