Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
When faced with difficult Sudoku puzzles, think that it’s all just numbers. You don’t need prior knowledge to play and solve the game. It even has nothing to do with math because you will not be solving any complex equations. So don’t get intimidated with the boxes and the numbers. Look at the puzzles, see the patterns and form your own conclusions. Good luck!