Logic Masters Deutschland e.V.

Normal sudoku rules do not apply. Divide the grid into rectangular regions. Inequality signs point to the region of the smaller size. Number the cells in the region from 1 to N, where N is the size of the region. Digits can repeat in the same row/column. The digits 1, 2, and 3 must appear at least once in each row and column. Cells separated by a chess king's move cannot contain the same digit. Clues outside the grid indicate the sum of the digits along that diagonal.

Links:

CTC
F-Puzzles