Sudoku Variations Puzzle Books for Nerds - Senor Sudoku - Bog

What does it mean to have a puzzle book of Sudoku variations? It means you won''t know the level of difficulty you''ll have to deal with next. Such a puzzle book is ideal for those who don''t mind a little bit of challenge daily. Relieve yourself of stress and condition your mind to see the world with a renewed perspective every time. Good luck!