In today's world, more people probably play solitaire by clicking a mouse than by flipping cards, but today's mentalfloss.com Brain Game Wednesday Wordplay challenge is old-school. Good luck! By changing one letter in each step to form English words, and leaving all other letters in their original positions, convert CARD into FLIP in the fewest possible steps. C A R D _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ F L I P Here is one 6-step SOLUTION. A 6-STEP SOLUTION: C A R D L A R D L A... READ ON

Good luck with 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

Today's mentalfloss.com Brain Game Think Thursday challenge needs but a number for its "solvation." Good luck! Identify the missing number in this sequence: 2, 2, 4, 12, 16, ?, 86, 602, ... Here is the ANSWER. THE ANSWER: 80 The sequence is times-1, plus-2, times-3, plus-4, times-5, plus-6, etc. Thanks for playing! Tomorrow, it's Free-for-all... READ ON

Good luck with today's mentalfloss.com Brain Game Tuesday Test Time challenge: Only two U.S. states have capital cities whose names begin and end with the same letter of the alphabet. Name these states (and their capitals). Here are the ANSWERS. THE ANSWERS: ATLANTA, Georgia, and AUGUSTA, Maine. Thanks for playing! Tomorrow, it's Wordplay... READ ON