Design a picture-based board game for Pre-K–Grade 2 that assesses and builds number sense and operational fluency with addition and subtraction up to 20 using shapes and repeating visual patterns. Include clear learning objectives, components and artwork guidance, age-appropriate game rules, a rule-based number sequence mechanic (how spaces advance or retreat), differentiation strategies, formative assessment notes, and three complete sample problem cards with worked solutions and suggested scaffolds for struggling and advanced learners. (Hard: requires creative, developmentally appropriate design.)