Logic Masters Deutschland e.V.

A new twist to killer cages combined with a prime constraint and yin-yang

Rules:

• Normal Sudoku rules apply.
• Shade some cells, such that all shaded and unshaded cells form each a contiguous orthogonally connected region, while no 2x2 may be entirely shaded or unshaded.
• Cages are either entirely shaded or entirely unshaded.
• Digits within cages may not repeat and sum to the total, if given.
• Adjacent digits in shaded cages must add to a prime number.
• Adjacent digits in unshaded cages may not add to primes.