Collins Su Doku - Su Doku Challenge Book 5: 200 Su Doku puzzles
Are you up to the challenge of 200 new Su Doku puzzles, arranged in easy, medium and difficult categories?
Keep your mind sharp and test your powers of deductive reasoning with these ever-popular number puzzles. Ideal for whiling away those long commutes, travelling on holiday or relaxing at home. The best value su doku puzzles around.