Readers are challenged to think deep through a series of carefully created activities designed to support critical thinking skills. As they explore the wide variety of puzzles, games, and other activities presented alongside vibrant illustrations, they are able to challenge themselves to further their cognitive development. A helpful key allows readers to independently check their results as they complete each activity. In addition, the activities are grouped by color based on skill levels so readers can choose the right ones for them. As readers train their brains, they discover that learning can be lots of fun!