Book excerpt: Besides being fun, puzzles increase student involvement and can lead to higher scores on problem-solving tests. Each book in this series has over 175 activities divided into four categories: picture, word, number, and logic. The puzzles are for individual students; the games are designed for pairs. Teachers can use them as fill-in activities for early finishers, to spice up homework packets, or as part of a reward system or weekly challenge. Beware! These puzzles can be addictive!