Life is full of waiting - the doctor's office, the DMV, train stations, airports - the list goes on, but if you like to use your spare moments indulging in sudoku number puzzles, this compact spiral-bound book with more than 400 puzzles will be your perfect take-anywhere companion. With puzzles guaranteed to sharpen your mind and keep you thoroughly entertained, this collection is a real treat for anyone who loves sudoku, and hates waiting around with nothing to do