What's this? A new mentalfloss.com Brain Game Monday Math Square challenge. Good luck! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the instructions to the letter, then... READ ON

The beginning of the week brings with it a new Monday Math Square mentalfloss.com Brain Game challenge. Good luck! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the... READ ON

Have you ever tried a Monday Math Square mentalfloss.com Brain Game challenge? Today's the day - just follow the instructions below. Good luck! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure... READ ON

Good luck solving today's Monday Math Square mentalfloss.com Brain Game challenge: Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the instructions to the letter, then pat... READ ON

Enjoy today's Monday Math Square mentalfloss.com Brain Game challenge: Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the instructions to the letter, then pat yourself on... READ ON

Today's Monday Math Square mentalfloss.com Brain Game challenge is the first of the summer. Give it a shot! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the instructions... READ ON

Today's Monday Math Square mentalfloss.com Brain Game challenge is full of nines (with a three thrown in for good measure). Give it a shot! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that... READ ON

Put your mathematics hat on and try today's Monday Math Square mentalfloss.com Brain Game challenge. More fun than Sudoku? Decide for yourself! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure... READ ON

~Monday morning, you sure look fine.~ Here's a new Monday Math Square mentalfloss.com Brain Game challenge. Good luck! Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square). Here is the SOLUTION. NOTE: These puzzles rarely (but occasionally) have alternate solutions that fit the rules. If you find one of these, first make sure that you've followed the... 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.