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Normal Sudoku rules apply.

Digits along an arrow sum to the digit in the circle cell attached to that arrow. Digits can repeat along an arrow if allowed by other rules.

Letters A,B,C,D are mysterious digits that need to be deduced (note that it's possible that some of the letters may represent the same digit).

A circle surrounded by four cells is a quadruple clue, i.e digits represented by letters in a circle surrounded by four cells must appear in those four cells.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Number

  • 1
  • A
  • a
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