When the million-selling series meets the most popular puzzles around, sales are sure to sizzle! Since the Sit & Solve series arrived in stores, these amusingly-shaped books have sold so many and so quickly they just won’t stay on the shelves.  And the coffee-cup inspired Sip & Solves are well on their way to the same success. So, they’re a natural format for sudoku, the puzzles that are rapidly replacing crosswords on everyone’s list of favorite pastimes.             It’s a brainteasing sensation that’s a no-brainer for any seller!