Dreamboat

Normal sudoku rules apply.

The heart outline is a palindrome (reading the same in both directions) containing the digits 1-9 exactly twice each.

Digits map to letters, so the 'M' and 'Y' digits are cloned in rows 4 and 5.

Heart symbols separate digits where one is double the other; ALL possible hearts are shown.

Digits along arrows may repeat, but must sum to the digit in the attached circle.