Pitter Patter

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.

Digits must not repeat at corresponding box positions.

Digits along diagonals pointed to by arrows outside the grid must sum to the number listed. Digits may repeat along the diagonal if otherwise allowed by normal Sudoku rules.

The digits in a cage must sum to the number printed in its corner. Digits may not repeat within a cage.