In this chapter, students explore engineering with a fun challenge. To help students better understand sound in a fun and engaging way, an engineering design–based science learning activity was conducted that is appropriate for a third- or fourth-grade classroom. In this activity, student teams were challenged to design, construct, and test a sound-reducing wall created from common classroom materials. This activity allowed students to explore the sound-absorbing or sound-reflecting properties of different types of materials, providing connections between science concepts and real-world experiences. Overall, this science activity exposes elementary students to the engineering design process of brainstorming, planning, building, and testing. A materials list, teacher background information, outcomes, assessments, and extensions are provided. This book selection includes the Table of Contents, Introduction, Acknowledgment, References, and Index.