From the authors of the bestselling Plexers and More Plexers come three new books to entertain and educate Each puzzle is a pictorial code for an idea related to social studies, science, or arithmetic. To crack the code look for clues in the size, position, and direction of the letters and symbols in the box. Each book includes 245 reproducible puzzles (with answers). The puzzles encourage the development of a variety of problem-solving and critical thinking skills. For teachers, the puzzles fit into any curriculum -- as a basis for class discussion, cooperative learning activities or as bonus or challenge questions on tests and quizzes.