Girandola Sudoku

Girandola Sudoku is a logical puzzle. This Sudoku variant contains one additional, 10th block, composed of 9 coloured cells.

Rules: In each cell of the 9×9 grid, enter a number in the range 1–9. Each number must appear exactly once in each row, column, and block.
Additional rules: 9 cells (one from each block) form the 10th block, shaped like a girandole (a fountain of several jets arranged in a circle).