Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
How long have you been thirsting for tempting, tantalizing teasers, craving for challenging cryptographic conundrums? A sequel to ''Have Some Sums to Solve'', this work can satiate the desires of even the most prolific puzzle enthusiast.