Title: Third-Degree Black Belt Kakuro, Author: Conceptis Puzzles
Title: Third-Degree Green Belt Kakuro, Author: Conceptis Puzzles
Title: Third-Degree White Belt Kakuro, Author: Conceptis Puzzles
Title: Symbolic Logic and the Game of Logic, Author: Lewis Carroll
Title: Brain Benders for Geniuses: Crosswords, Logic Puzzles, Word Games & More, Author: Peter Ritmeester
Title: Brain Benders for Eggheads: Crosswords, Logic Puzzles, Word Games & More, Author: Peter Ritmeester
Title: Bible Coded: A Collection of Cryptograms of Bible Teachings, Author: David Conine