Sudoku is a fascinating mind game, equally interesting to the young and old. It is in some ways similar to games we all grew up with like Ludo, Chess etc. The main difference is that here you play without an opponent, like the game of Golf where your own performance is compared with that of others who may be playing on a different green. But here you always win because you can take a second chance The book authored by K S Rao does not talk about any theories. The book in simple English tells the readers how to observe the numbers and blanks and how to fill the blanks. He has solved step by step 62 puzzles from 'Easy' to 'Evil' and the 'Tough' with logical explanations at every step. This book shuns any kind of assumptions or guessing or even use of a pencil and eraser. By following the methods put forward by Mr. Rao, I am sure that 99% of all Sudoku puzzles can be solved by even a fresher. He has unveiled a new logical concept "CASTLING", a delightful innovation.