Arrow Sudoku

Use ordinary Sudoku units. The digits on a shaft sum to the single circle digit. The circle is not included in that sum.

1. Select an empty cell, then choose a digit or switch Notes on.
2. Ask for a gentle hint: attention first, proof next, then the conclusion only when you request it.
3. Undo uncertain moves or pause. Every puzzle is open; daily selections use a separate save.

Select a cell · 1–9 fill · N notes · arrows move · Delete erase · Ctrl/Cmd Z undo

For a circle containing 5 with a two-cell shaft, the shaft may contain 1+4 or 2+3 in a legal order. The circle itself is not part of the sum. Start at the circle and follow the arrow tip.

A shaft cell may repeat another shaft digit when their ordinary units permit it. Do not import the Killer no-repeat cage rule. The candidates must still fit their own rows, columns and boxes.

If one shaft cell is 2 and the circle is 7, the other shaft cells together total 5. With an unfilled circle, narrow possible circle values and shaft sums in both directions.

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