Collins coffee break su doku. Book 4

Stretch your powers of logical deduction with these 200 new Su Doku puzzles, in easy, medium and difficult categories. Keep your mind sharp and test your powers of deductive reasoning. Ideal for whiling away those long commutes, travelling on holiday or relaxing at home. There are puzzles here for all levels ranging from easy, through medium and difficult. Coffee Break Su Doku will satisfy on every level.