Dark and Stormy

Title: Dark and Stormy

Rating: 4/5

As the hardest mix puzzle yet posted, you may feel the need to make yourself the titular drink.  If so, it's dark rum and ginger beer on the rocks, garnished with lime.

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 (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.

Squint

Title: Squint

Rating: 2/5

If you look at this puzzle just right, you'll see.....well, nothing but the puzzle.  But it's fun to try anyway.

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.

Iron Throne

Title: Iron Throne

Rating: 4/5

The hardest puzzle yet posted (in my opinion--as ever, feel free to post thoughts about the difficulty rating in the comments), and one that belies a fascination with a certain fantasy world.  If you get too frustrated, calm down: you don't want to lose your head.

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.

Screwdriver

Title: Screwdriver

Rating: 3/5

While a classic screwdriver isn't garnished, the yellow and green are for potential lemon or lime atop the rim of the glass.

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 (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.