I was hoping for Frank Longo's typical Mensa books difficulty which I found fascinating and totally fun. I tried the last puzzle in the book and then gave it to a friend.
Challenging but doable without guessing! I find Frank longo's puzzles among the best there are.
I have a hard time finding books that are challenging. They may name the puzzles hard but may not be.
Frank R. Stockton
Frank Bourassa
Frank Gunderson
Frank Warren
Frank Warren
Frank Frössel
Frank Sobott
Frank Kleinehagenbrock
Frank Kleinehagenbrock
Frank J. Webb
Frank Moore
Gardner, Frank
Frank Brand
Frank Wyman
Frank Leymann
Gardner, Frank
Frank Bognar
Frank Welz
Frank Rijmen
Frank Murphy
Frank H. Melland
Frank H. Melland
Ulrich Frank
Frank S. Corotto
Frank Van Breusegem
Frank Kunert
Frank X. Walker
Frank Gertcher
Frank Welz
Frank F. Rosenblatt
Anita Frank
Frank H. Melland
Frank R. Werner
Frank Sode
Frank Göttmann
Frank Costigliola
Frank X. Walker
Frank H. Melland
Frank X Walker
Frank Sode
Frank Costigliola
Ulrich Frank
Frank Strausser
Frank Sode
Frank N. Crespilho
L. Frank Baum
Frank N. Egerton
Frank Murphy
Frank Rönicke
Frank Fedele
L. Frank Baum
Skinner, Frank
Lyman Frank Baum
Britt Frank
Frank Herbert
Frank Jacob
L. Frank Baum
Kira Artemis Russo
Sanja Rešček
Bradley R. Schiller
Laila El-Haddad
Ghenadii Korotcenkov
Rich Thomas
Tony Trischka
Kathryn Smithyman
Dave Lowe
Jo Anne M. Craig
Abass Alavi
Aharon Rosen
Christian Brandle
Ronald W. Pies
Doreen Virtue
Joe Gentile
D.J. Milky
Robert C. Girard
Philip S. Mellor
Future Press
Neil T. Anderson
Steven L. Case
Karmel Schreyer
Kenneth N.E. Cox
Karen McCombie
Holly Webb
Pete Billmann
Sarah Watts
Roderick Hunt
Julia Jarman
Carl R. Proffer
Graham McFarlane
Alex T. Smith
Alistair Cooke
Fiona Carnarvon
John Shepherd (2)
Benjamin Lytal
Alasdair Wickham
Mohamed El-Bisatie