Title: Elasticity

Rating: 3/5

 The digits 1 through 9 appear in each row and each column exactly once.
 Digits in each shaded region must multiply to the indicated product (mod 9).
 Squares with multiple colors contain a number that’s used in the product for adjacent regions of each of those colors.
 Remember: numbers can repeat within a shaded region if that doesn't violate the first rule.