Next best price is £9.93 at The Hut. Sounds like a blast, if you enjoy sudoku.
Taken from the site :-
Use the art of zen with 'Zendoku', a new and accessible approach to the enormously popular Sudoku puzzle game for Nintendo DS! 'Zendoku' features fun and intuitive battle puzzle gameplay in a range of single and multiplayer game modes. Using the unique control systems of your handheld console you can challenge and defend yourself against a range of engaging martial arts-themed characters.
With a carefully considered learning curve, entertaining storylines and addictive gameplay with unlimited puzzles, audiences everywhere can find the path to enlightenment.
Sudoku Gameplay Inspired by the rules of the biggest puzzle craze currently sweeping the globe.
Relevant, Unique Setting A light-hearted martial arts theme compliments the Far Eastern origins of Sudoku and the unique gameplay of 'Zendoku'.
Engaging Characters Challenge a range of diverse and colorful characters, with unique storylines and special abilities.
Fun Battle Action Defend yourself from and reflect enemy attacks, gameplay never before seen in a Sudoku-based videogame. Blow away obstacles, spin vault handles, block punches and much more.
Intuitive Controls Use the unique stylus and microphone on Nintendo DS to defend against attacks and place numbers and symbols.
Black Belt Presentation A wide variety of background levels, character animations and attack effects.
Comprehensive Range of Play Modes, including Dojo, Classic and Zen in 1-Player Mode, and 2-Play Battle and co-op modes, and more!
Unlockable Content Get rewarded with new characters and attacks depending on your success in the Quest mode.
Infinite Puzzle Permutations Longevity of gameplay is assured with an infinite variety of grid permutations.