Challenge:
Kudosu is a variant of the well-known Sudoku puzzle. The 81 cells in the following 9 × 9 scheme are to be filled with the digits 1, 2…, 9 so that each row and each column contains each of these nine digits exactly once. Furthermore, each of the nine regions (framed with bold lines) should contain each of these nine digits exactly once.
We would like to know: Which digit is going to show up in the cell marked by a star?
Artwork: Friederike Hofmann
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Possible answers: