Colour Killer Sudoku — Knight Features

The normal rules of Killer Sudoku apply. In addition, the grid is divided into coloured cells. Cells of the same colour must also contain all the digits from 1-9.

Killer sudoku - Wikipedia

Sudoku - Wikipedia

Guy solves the most insane Sudoku puzzle : r/videos

Colour Killer Sudoku — Knight Features

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Colour Killer X Sudoku — Knight Features

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