Logic Masters Deutschland e.V.

Solve in SudokuPad

Normal Sudoku rules apply.

Each circle is either a lighthouse, a shadehouse or both. If a circle has yellow outward pointers, it is (at least) a lighthouse. If it has blue inward pointers, it is (at least) a shadehouse.

Lighthouses count how many cells smaller than themselves they see in all four cardinal directions combined, where digits larger than themselves block line of sight.

Shadehouses count how many cells larger than themselves they see in all four cardinal directions combined, where digits smaller than themselves block line of sight.

Lighthouses and shadehouses are treated independently; if a cell is both, it must be a valid lighthouse and, separately, a valid shadehouse.