Heavy, very heavy and extremely difficult Sudokus in perfect quality are the proverbial needle in the huge haystack of nameless Sudoku irrelevance. Here is the only true book for everyone who has a Sudoku under the pencil not for the first time - supply for all who have already solved one of the most successful German Sudoku books (volume 2 of this puzzle library). 200 new puzzles with guaranteed only one correct solution - created by Stefan Heine, the creator of the German Sudoku Championships. Stefan Heine's puzzle library Stefan Heine is one of the few renowned and well-known puzzle makers. The book series "Heine's Riddle Library" is constantly being expanded and contains selected quality puzzles at the highest level of craftsmanship - brain jogging in a class of its own! Meanwhile this series comprises 19 volumes - among others exclusively all puzzles.