The 2012 presidential election is less than six months away, so let's brush up on some former Commanders-in-Chief in today's mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck! The last names of four former U.S. presidents contain the consecutive letters "OO." Name all four. Here are the ANSWERS. THE ANSWERS: Calvin COOLIDGE, Herbert HOOVER, Franklin ROOSEVELT, and Theodore ROOSEVELT. Thanks for playing, and have a great... READ ON

Today's mentalfloss.com Brain Game Think Thursday challenge is a "quickie." Good luck: What four-letter English word for a particular type of animal has no rhyme? Here is the ANSWER. THE ANSWER: WOLF. Thanks for playing! Tomorrow, it's Free-for-all... READ ON

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

You don't have to look beyond the borders of the good old USA to find the answer to today's mentalfloss.com Brain Game Tuesday Test Time challenge. Good luck: What do these five U.S. states have in common that no other U.S. states do? California, Georgia, Missouri, New York, Utah Here is the ANSWER. THE ANSWER: Each has been the host of an Olympic Games (either Summer or Winter). Thanks for playing! Tomorrow, it's Wordplay... 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

Kara and I will be visiting the Motor City ComicCon this afternoon, which means we may be distracted by the likes of Erin Gray and Peter Tork. In the meantime, enjoy the mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck! WARD, REED, ROSS, IVAN... Which of the following four-letter names best completes the above list, and why? OMAR, BONY, THOM, CARL Here is the ANSWER. THE ANSWER: BONY. Each name, when prefaced with a successive letter of the alphabet, forms a word: A +... 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

Today's Wednesday Wordplay challenge at the mentalfloss.com Brain Game asks you to choose between four commonly-misspelled words that end with the letters "ABLE." Three are spelled correctly; one is not. Good luck! Just ONE of the four words in the following list is misspelled. Identify the culprit: CHANGEABLE EXCITEABLE MANAGEABLE NOTICEABLE Here is the ANSWER. THE ANSWER: The misspelled word is EXCITEABLE. The correct spelling is EXCITABLE. Thanks for playing! Tomorrow, it's Think... 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

To moms everywhere, we dedicate 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... READ ON

The mentalfloss.com Brain Game. Free-for-all Friday. Have at it! Here's an alphabetical list of five words: BLACKED, PACKAGE, POLLACK, SLACKED, TACKIER Which one of the following four words best fits in with the above group, and why? BACKLOG, CRACKLE, CUTBACK, QUACKED Here is the ANSWER. THE ANSWER: BACKLOG. Each of the five words still form a word when the letter sequence "ACK" is removed. BLACKED - ACK = BLED PACKAGE - ACK = PAGE POLLACK - ACK = POLL SLACKED - ACK = SLED TACKIER -... READ ON

Can you win mentalfloss.com Brain Game Think Thursday challenge? It's a gamble! In the betting game known as craps, the player starts by rolling two dice and combining their values. On the first roll, 7 or 11 is an automatic win (a "pass"), while a roll of 2, 3, or 12 is an automatic loss ("craps"). Every other roll is called a "point" and allows the roller to keep rolling in an effort to match that point. On the first roll of the dice, what are the odds of a craps roller rolling a point instead of... READ ON

Today's mentalfloss.com Brain Game Wednesday Wordplay challenge is a Word Ladder puzzle named after an old Ned Miller song. Good luck! By changing one letter in each step to form English words, and leaving all other letters in their original positions, convert JACK into KING in the fewest possible steps. J A C K _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ K I N G Here is one 5-step SOLUTION. A 5-STEP SOLUTION: J A C K T A C K T I C K K I C K K I N K K I N G Did you come up with a different... READ ON

Geography is a common subject for the mentalfloss.com Brain Game's Tuesday Test Time challenge. Maybe we'll change the name to Tuesday Travels. What do you think? Name the 5 independent South American nations whose short-form English names end with the letter A. Here are the ANSWERS. THE ANSWERS: ARGENTINA, BOLIVIA, COLOMBIA, GUYANA, and VENEZUELA. Tomorrow, it's Wordplay... READ ON

It's the first Monday in May, so merrily mull over this Monday Math Square as today's 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... READ ON

Good luck with today's mentalfloss.com Brain Game Free-for-all Friday challenge: Examine the 4 pro baseball game scores that follow, then figure out the score of the 5th game: Chicago 1, New York 0 Philadelphia 5, Miami 2 Cleveland 2, Baltimore 0 Los Angeles 3, Kansas City 2 Seattle ?, Oakland ? Here is the SOLUTION. THE SOLUTION: Seattle 2, Oakland 1. The scores represent the number of letters that appear twice in each city's name. Thanks for playing, and have a great... READ ON

ABBA had to negotiate the rights to their name with a canned fish company.