Normal sudoku rules apply. Numbers outside the grid are little killer clues, look-and-say little killer clues and sandwich clues: Digits along diagonals indicated by arrows sum to the number given. Also, the first digit in a clue indicates the number of times the second digit in the clue appears along the indicated diagonal. Also, a clue outside the grid shows the sum of the digits sandwiched between the 1 and the 9 in that row/column. Cells separated by an V sum to 5.