Purpose: In this project, the team proposed to develop a prototype of an online coding game to prepare middle and high school students for success in postsecondary education and career pathways in computer science. The prototype was to include a visual tool to support students move from two-dimensional to three-dimensional thinking, lesson plans for teachers, and video tutorials and examples for students and teachers. At the end of Phase I, the team would conduct in a pilot study with 30 high school students to examine whether the prototype functioned as planned, if educators could integrate the game within standard practice, and if the game showed promise for improving student attitudes about and skills related to coding.