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# Blaine's Puzzle Blog

## Weekly discussion on the NPR puzzler, brain teasers, math problems and more.

Updated: 2018-04-23T14:30:21.601-07:00

New Year's Resolution: Exercise Your Brain

2018-01-23T00:17:07.720-08:00

As long as everyone is making New Year's resolutions, I hope you've made one to get more mental exercise. To start you off, here's a challenging "Cross Number Puzzle." The grid above is filled in like a traditional crossword puzzle, except every answer is a three-digit number (100-999) rather than a word. Warning: some of the clues may have you going in circles but there is a unique solution..

Don't worry, you can get around to your other resolutions, like not procrastinating, and going to the gym later. Go sit on the sofa and work on a puzzle instead!

Across:
1. 3 Down plus 5 Across
3. One-seventh of 8 Across
5. Half of 14 Across
6. A prime number
8. Seven times 3 Across
10. Twice 7 Down
12. A perfect square
14. 9 Down reversed
15. The sum of its own digits, times thirty-seven
16. A perfect square

Down:
1. 13 Down plus 10 Down
2. Average of 9 Down and 14 Across
3. 1 Across minus 5 Across
4. A multiple of three
7. 16 Across minus 1 Across
9. 1 Across plus 5 Across
10. 13 Down plus three hundred
11. 12 Down minus 1 Down
12. Anagram of 4 Down
13. 1 Down minus 10 Down