The Wall Street Journal presents its beloved number puzzles in book form for both at-home relaxation and brain training. Sharpen your brain and your pencils and relax your mind with the second book of number puzzles from The Wall Street Journal. A weekly staple of the paper is now in book form for puzzle fanatics to try and solve the most elegant, adventurous, and addictive number puzzles on the market, featuring killer sudoku, cell blocks, and suko.