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Broken Entropy
Place the digits 1-9 in each row, column, and box.
Digits separated by an X must sum to 10. Digits separated by a V must sum to 5.
For every possible two-by-two region that does not contain a shaded cell, there may be a maximum of two even digits (2, 4, 6, 8), and a maximum of two prime digits (2, 3, 5, 7).
Digits separated by an X must sum to 10. Digits separated by a V must sum to 5.
For every possible two-by-two region that does not contain a shaded cell, there may be a maximum of two even digits (2, 4, 6, 8), and a maximum of two prime digits (2, 3, 5, 7).