ISBN-13: 9780061173370 / Angielski / Miękka / 2006 / 320 str.
200 New Difficult Puzzles -- They Are Not Going to Be Easy But You Are ReadySu Doku, "the crossword without words," comes with a warning: it is seriously addictive. You don't need to be a mathematical genius to solve these puzzles; it is simply a question of logic and a little patience.