Test your powers of logic with these fun Su Doku puzzles. To feed the nation's addiction further, here is the sixth instalment of The Times Su Doku puzzles. Now with even more puzzles for the hardened Su Doku addict, The Times Su Doku Book 6 contains 150 puzzles, ranging from mercifully Mild to the uber challenging Super fiendish.40 Mild puzzles 50 Difficult puzzles 50 Fiendish puzzles 10 Super fiendish puzzlesWith brand new puzzle suppliers, market-leader The Times offers a whole new collection of numerical conundrums for your brain to wrangle with.