Explore an open-source cyber gym providing hands-on security labs in the Google Cloud environment. Learn about this flexible learning platform that allows instructors to use pre-built workouts mapped to NICE Framework and Security+ Standards or create custom exercises. Discover how the system can be scaled for various class sizes, enabling students to control their workouts independently both in and out of class. Examine the deployment experience to over 500 students in Arkansas, including associated cloud costs for different exercises. Follow along with a live demonstration of the instructor setup process and automated assessment reporting. Gain insights into this NSF-supported project, with access to the GitHub repository for further exploration and implementation.