Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
This is a book of 50 hand-picked puzzles that you will enjoy solving. The most valuable part though is the set of solutions. The new innovative solutions will show you how to solve hard problems the easy way without wasting time on random attempts. It is the book that sure will boost your brain power and make you see new ways to solve problems.