Logic Masters Deutschland e.V.

Rules:

Place the digits 1-9 once each into every row, column, and box.

Shade some cells in the grid such that all cells of the same shading are orthogonally contiguous, and no 2x2 area is entirely the same shading.

A digit N on a shaded circle counts the number of digits in the (up to 8) surrounding cells that are greater than or equal to N.

A digit N on an unshaded circle counts the number of digits in the (up to 8) surrounding cells that are less than or equal to N.

A small circle separates two cells of the same shading. Every pair of digits separated by a small circle has a different difference.

Play on SudokuPad

Have fun solving!