Today's mentalfloss.com Brain Game is a new Monday Math Square. This one might be a little tougher than usual, so we've spotted you one digit (the 2) to help get you started. 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). One digit is already provided for you. Place the remaining 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 make sure that you've followed the instructions to the letter, then pat yourself on the back (and feel free to share your numbers with us in the comments).

THE SOLUTION: