Daily puzzle (2021-04-18)

Difficulty: Rating: Comments


Author: Vladimir Portugalov

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Place digits from 1 to 4 into the grid, so that each digit appears exactly once in each row and column. No 2x2 square can be completely filled with digits.

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.