The battle begins for the sudoku ninja, with no advanced techniques required! Sudoku is the martial art of puzzles, so keep your mind fighting fit with this collection of energetic enigmas and numerical conundrums. Its handy format means it's also perfect for solvers on the go and because it is easy-to-learn, addictive and language free, it's suitable for anyone and everyone! Endlessly challenging, today's hottest puzzle craze will provide hours of fun!