It's many readers' favorite way to start the week: The Monday Math Square Brain Game at mentalfloss.com! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules.... READ ON

Today's mentalfloss.com Brain Game offers you Math Square #81. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first... READ ON

The three Ms for today are mental_floss, Monday, and Math Square. Enjoy! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first... READ ON

It's Monday Math Square time once again, so give today's mentalfloss.com Brain Game your best. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules.... READ ON

A brand new Monday Math Square is the challenge in today's mentalfloss.com Brain Game. Enjoy! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find... READ ON

Math Square #77 is the attraction for today's mentalfloss.com Brain Game. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of... READ ON

Welcome to Math Square #76, with Orson Bean! Brett Somers! Charles Nelson Reilly! No, wait, that's Match Game '76. Never mind. But enjoy today's Brain Game anyway. The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is my SOLUTION. NOTE: These puzzles rarely (but... READ ON

Please enjoy today's Brain Game, the Monday Math Square. Lots of division signs on this one, meaning it could be very easy (or very tough). There's only one way to find out which. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is my SOLUTION. NOTE:... READ ON

The Brain Game kicks off another week here at mentalfloss.com. Today's Monday Math Square is a bit unusual, in that five of the six calculations result in the number 2. Will this make the challenge easier or more difficult? Find out below. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work... READ ON

If the image gods are listening today, you'll see Monday Math Square #73 below for today's mentalfloss.com Brain Game. Good luck! The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid (the red square). Place the digits 1 through 9 in their correct spots so that the mathematical equations work both across and down. Here is my SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate... READ ON

5 Questions: Constellations

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About one in every 4 million lobsters is born with a rare genetic defect that turns it blue.