Sudoku and Crosswords, you can't beat these two when it comes to giving some exercise to your mind.
But, if you think solving tiny Newspaper crossword puzzles is boring give this crossword puzzle a try. Because, this crossword hangs on a full seven feet by seven feet of wall space and has 28,000 clues for over 91,000 squares, making it the World's largest crossword puzzle to solve.
And it ain't an easy to thing solve, believe us. You can take months and even a year to solve it, even the clue book is 100-pages long! As a consolation it does fold for lap or tabletop solving and comes with storage box to carry it around. Awesome, just what you need to give your talkative friend and keep him busy for a year! Grab it for US$29.95 from here.