Thinking and Vocabulary Fun! Effective vocabulary building with a "puzzling" twist. By analyzing words and their meanings then changing one word into another through careful substitution of letters, students build spelling, vocabulary, and comprehension for top grades and test scores in all subjects. Subtle word changes encourage students to think through their vocabulary and deduce unknown words to complete each puzzle. Teaching Support: Includes brief teaching suggestions, practice activities, and answers. 30 activities. License: reproducible.