Logic Masters Deutschland e.V.

I highly recommend to grab some paper and scissors in order to attempt this puzzle.
Maybe solving this one first helps. No guessing is needed at all.

Rules

• Normal sudoku rules apply.
• We define a "recte" as a rectangle of size 1 x n (or n x 1) that acts both as a renban line and as a thermometer (it consists of n consecutive numbers that increase from an extreme). Fill the grid with a recte of size 9 and two rectes of each size from 1 to 8. All rectes must be different and cannot intersect.

Link

• SudokuPad