Daily puzzle (2021-10-30)

Scores

Double Sudoku

Author: Andrey Bogdanov

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Place a digit from 1 to 4 in each empty cell so that each digit appears exactly twice in each row, column, and outlined region. Identical digits cannot share an edge.

Example puzzle

Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.