Irregular 4x4 Sudoku: Place the digits 1-4 exactly once in every row, column, bold-outlined region, and marked diagonal.
Renban Lines: Purple lines in the grid are Renban lines. Digits on a line form a set of non-repeating, consecutive digits in any order.
Kropki Dots: Digits separated by a white dot are consecutive. Digits separated by a black dot have a 1:2 ratio, meaning one is exactly double the other.
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Solution code: Row 4
on 23. December 2025, 21:58 by NotSoMagnifique
Classic and cute.
on 21. December 2025, 20:49 by googuee
Updated the name