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The Brain Teaser Challenge invites you to play brain teasers for 300 minutes over the next 30 days, or an average of 10 minutes a day. Some examples include crossword puzzles, word searches, Sudoku, and memory games; but you can choose any brain teaser that you like. Today there are even mobile apps specifically designed to increase your brain’s capacity. The idea is to exercise your mind which, just like a muscle, becomes stronger with use.