Normal sudoku rules apply. Each of the following standard clue types occurs exactly three times in the grid: white dots, black dots, arrow, sandwich, Xs, Vs, thermos, quadruples, odds (grey circles), evens (grey squares), renban (purple) and German whispers (green). For each of those clue types, exactly two of the appearances of that clue are correct and the other is incorrect. [A clue is incorrect if it is not fully correct. Eg an incorrect quadruple might see one of the digits but not all of them.]