Arrow Sudoku rules and puzzles

The case notes

Use the rule of 45 to find an arrow circle

Here, two Killer cages and an arrow meet in one Sudoku row. The cages cover seven cells; the arrow shaft takes the other two. Watch a worked example, then try the idea in a puzzle.

Put it into practice

Cages beside an arrow

Here, two Killer cages and an arrow meet in one Sudoku row. The cages cover seven cells; the arrow shaft takes the other two.

45 − 18 − 24 = 3

The whole row totals forty-five. The cages give eighteen and twenty-four, making forty-two. That leaves three for the two shaft cells together.

Circle = shaft total

An arrow circle equals its shaft’s sum. We do not need to know which shaft cell is one or two yet. Their total already fixes the circle.

The circle is 3

The circle is three. The rule of forty-five gave us the missing sum, and the arrow carried that sum to a different cell.

Read the transcript

Here, two Killer cages and an arrow meet in one Sudoku row. The cages cover seven cells; the arrow shaft takes the other two. The whole row totals forty-five. The cages give eighteen and twenty-four, making forty-two. That leaves three for the two shaft cells together. An arrow circle equals its shaft’s sum. We do not need to know which shaft cell is one or two yet. Their total already fixes the circle. The circle is three. The rule of forty-five gave us the missing sum, and the arrow carried that sum to a different cell.

Keep following the clues