Normal sudoku rules apply. Cages indicate the sum of numbers within them in the top-left corner (but see below). Digits may not repeat within a cage. Arrows indicate the sum of numbers along their diagonal (but again see below). Digits may repeat along a diagonal. The numbers involved in clues can be single-digit or straight multi-digit numbers (but each digit can only contribute to one such number). Vertical numbers are read top-to-bottom, and horizontal and diagonal numbers are read left-to-right.