200 Hard Sudoku Puzzles that will keep you busy for a long time.
HAPPY SUDOKU.
All solutions, easy to read, are shown at the end of the book.
No hypothesis is needed.
All our SUDOKU\'s are correct and include only one puzzle solution.
Big Sudoku boards With lots of space to write your solutions, it\'s also a VERY LARGE PRINT , there is a puzzle for every page With white spaces where you can do your calculations. 200 Hard Sudoku Puzzles that will keep you busy for a long time