Logic Masters Deutschland e.V.

Cells with grey circles must contain an odd number.

Cells with grey squares must contain an even number.

The cells with marked circles AND squares both show the exact number of ODD digits in orthogonally adjacent cells. (So a circle with a 1 must have exactly one digit in an orthogonally adjacent cell. The 1 itself does not count against this restriction).

There IS a negative restriction. All such cells are shown, and cells without a square or circle cannot have a digit equal to the number of orthogonally adjacent odd cells.

Try Odds and Evens on your choice of:

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