Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
If there’s one thing more challenging than your math book, it’s a book of all numbers. The difference is that your textbook tells you if you have to divide, add, multiply or subtract equations in order to get the answers; but in this puzzle book you are left on your own. You have to figure out the reasoning behind the sequences. Can you do that?