Countdown

Title: Countdown

Rating: 3/5

There is renewed interest in space travel of late.  Perhaps the astronauts could take along some of these puzzles for the downtime?

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.