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Today's mentalfloss.com Brain Game Think Thursday challenge is a bit more involved than most, but it's still easy to play. Just please make sure to read these instructions carefully before tackling it: Your goal: Make the equation [ 1 2 3 4 ] work by adding some combination of the four basic mathematical symbols + - × / and the equals sign = Important: You cannot change the position of the digits, nor add any digits, symbols, or marks other than some combination of the five mentioned.... READ ON

Here's a new word ladder puzzle for today's mentalfloss.com Brain Game Wednesday Wordplay challenge: By changing one letter in each step to form English words, and leaving all other letters in their original positions, convert CASH into LOAN in the fewest possible steps. C A S H _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ L O A N Here is a 6-step SOLUTION. A 6-STEP SOLUTION: C A S H C A S T C O S T C O O T C O O N L O O N L O A N Did you come up with a different sequence of words?... READ ON

The 2010 U.S. Census has provided source data for many of our puzzles, and today's mentalfloss.com Brain Game Tuesday Test Time challenge is a prime example. Good luck: The three most populous cities in which U.S. state each begin with the same letter of the alphabet? Here is the ANSWER. ANSWER: OHIO. Its three most populous cities are Columbus, Cleveland, and Cincinnati. Thanks for playing! Tomorrow, it's Wordplay... READ ON

Today's mentalfloss.com Brain Game Monday Math Square challenge follows: 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... READ ON

Say hello to Barbara, whose likes and dislikes will help you solve today's mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck! Barbara loves Oregon, but is not so fond of Washington. She drinks Coca-Cola, but steers clear of Mountain Dew. She likes Geronimo but doesn't care for Sitting Bull. Barbara enjoys the ukulele but not the bagpipes. She'll eat bananas but won't touch grapes. With all these in mind, which of these classic rock bands would Barbara most likely listen... READ ON

Hop across the Atlantic to solve today's mentalfloss.com Brain Game Think Thursday challenge. Good luck! The short-form English names of exactly three independent European nations have only one syllable each. Name all three. Here are the ANSWERS. ANSWERS: FRANCE, GREECE, SPAIN. Thanks for playing! Tomorrow, it's Free-for-All... READ ON

Cast your line and see if you can land today's mentalfloss.com Brain Game Wednesday Wordplay challenge: By changing one letter in each step to form English words, and leaving all other letters in their original positions, convert WORM into FISH in the fewest possible steps. W O R M _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ F I S H Here is a 5-step SOLUTION. A 5-STEP SOLUTION: W O R M W O R E W I R E W I S E W I S H F I S H Did you come up with a different sequence of words? Feel free to... READ ON

Today's mentalfloss.com Brain Game Tuesday Test Time challenge provides the scrambled names of three hit motion pictures. Unscramble the anagrams to find the names of the movies. Good luck! Who Lets Forward (2005) Swoop Anyplace (1979) Doughy Dragon (1993) Here are the ANSWERS. ANSWERS: Who Lets Forward (2005) = War of the Worlds Swoop Anyplace (1979) = Apocalypse Now Doughy Dragon (1993) = Groundhog Day Thanks for playing! Tomorrow, it's Wordplay... READ ON

Good luck solving today's mentalfloss.com Brain Game Monday Math Square 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

It's time to don your thinking cap and tackle today's mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck! When spelled out, the number 74 contains 7 letters and then 4 letters ("seventy-four"). What's the only other two-digit number that similarly matches its digits to the number of letters in its name? Here is the ANSWER. THE ANSWER: 54. (Fifty has 5 letters, and four has 4 letters). Thanks for playing, and have a great... READ ON

The medical term for ice cream headaches is sphenopalatine ganglioneuralgia.