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 one shading.

Shaded cells are hot, increasing their digit's value by one.
Unshaded cells are cold, decreasing their digit's value by one.

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

Play on SudokuPad

Have fun solving!