Combi

The Combi(nation)Sudoku is a traditional Sudoku (in various degrees of difficulty) combined with 81 letters.
Out of these letters the challenge is to find the eight corresponding words, each with a length of nine letters.
This type of Sudoku has several levels of difficulty indicated by * (= simple) to ***** (=extreme difficult).

This is an example of a Combi Sudoku with below the solution.