A Four Color Problem

Title: A Four Color Problem (original)

Rating: 4/5

On the last sum puzzle, I had no inspiration for the title.  This week's puzzle is the first sum puzzle I created.  The second was published in MAA Focus; so consider this a two-for-one week.

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.

Papa Doble

Title: Papa Doble

Rating: 2/5

Also known as the Hemingway Daiquiri, this is made with white rum, the juice of limes and grapefruit, and some maraschino liqueur. 

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.

Churn

Title: Churn

Rating: 2/5

Only a little bit of agitation in this product puzzle, unlike the last one.

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.

Pending

Title: Pending

Rating: 3/5

Sometimes the puzzle just doesn't come out looking like anything to me.  As one of the few times that's happened, this sum puzzle got an generic title.

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.