Title: Lighten Up

Rating: 2/5

Given the desire to have a puzzle where the colors steadily faded as one travels inward, there are lots of untwisty regions. Hence the easier rating.
The official rules:
 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.
 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.
Title: Microscopic

Rating: 4/5

I suppose this one would pair nicely with Petri Dish in name, but it's not quite as difficult as that one.
The official rules:
 The
digits 1 through 9 appear in each row and each column exactly once.
 Digits
in each shaded region must add to the indicated sum.
 Squares with multiple colors contain a number
that’s used in the sum for adjacent regions of each of those colors.
 Remember: numbers can repeat within a shaded region if that doesn't violate the first rule.
Title: Nothing

Rating: 2/5

In the last of the tweaks, this week's puzzle is a mix puzzle with 0 thru 8 instead of 1 thru 9. And yes, this really is a drink: it's made with Malibu rum, Midori, pineapple juice, and it's served on ice.
The official rules:
 The
digits 0 through 8 appear in each row and each column exactly once.
 Digits
in each shaded region must add to the indicated sum (denoted by +) or multiply to the indicated product (denoted by *).
 Squares with multiple colors contain a number
that’s used in the sum/product for adjacent regions of each of those colors.
 Remember: numbers can repeat within a shaded region if that repetition doesn't violate the first rule.
Continuing the theme from last week's puzzle, here's a product puzzle with one tweak: 0 thru 8 instead of 1 thru 9.
The official rules:
 The
digits 0 through 8 appear in each row and each column exactly once.
 Digits
in each shaded region must multiply to the indicated product.
 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.