Use this assortment of puzzles to give your mind a workout. A 10-year study showed that a brain game that shortens response time may also reduce your dementia risk. Challenge your own noggin with the mind teasers in this chapter. ONE OF THE BEST WAYS TO SHARPEN YOUR BRAIN IS TO LEARN NEW THINGS. CRYPTOGRAM IN A CRYPTOGRAM, OR SECRET-CODE PUZZLE, EACH LETTER IN THE ORIGINAL MESSAGE IS REPLACED BY ANOTHER LETTER IN A SPECIFIC PATTERN. (FOR EXAMPLE, DOG CAN BE ENCRYPTED TO READ CNF BY REPLACING