My First Logic Workbook for Gritty Kids Spatial Reasoning, Math Puzzles, Logic Problems, Focus Activities. (Develop Problem Solving, Critical Thinking, Analytical & STEM Skills in Kids Ages 4, 5, 6.) — Dan Allbaugh
Brainteasers and Riddles for Gritty Kids 300 Difficult Mind-Bending Lateral Thinking, Logic, and Math Puzzles for Kids and Families — Dan Allbaugh