Logic Masters Deutschland e.V.

1. Normal sudoku rules apply.
2. Primes can’t project on the same digit through rotational symmetry (±90 or 180 degrees).
3. One of the prime digits is special, must appear in shaded cells, and can’t ever repeat diagonally.
4. In boxes where the special digit appears on the box diagonals, digits in each box row are sequential modulo 9, e.g., [1 2 3] or [8 9 1].

Solve in CTC Sudokupad.

Solve in F-puzzles.

This puzzle is another version of my earlier puzzle, All Paths Lead Forward, with a much simplified break in.