Less is more! 17 given numbers in a Sudoku are the measure of things, and less is not possible. At least not if there is to be only one possible and correct solution. Over 40 million Sudokus were needed to find these 200 masterpieces. It doesn't get rarer than this, and no Sudoku can be more beautiful than these rarities. These puzzles are difficult, but always solvable with pure logic. No guessing, no trial and error is necessary, making these Sudokus a staple of all previous championships. Stefan Heine is one of the few renowned and well-known puzzle creators. The book series "Heine's Puzzle Library" is constantly being expanded and contains selected quality puzzles at the highest level of craftsmanship - top-notch brain training! This series now includes 22 volumes - including exclusively all the puzzles from the major global championship.