This study explores energy-saving efficiency in sandbox game server management, using Minecraft as a case study. The primary goal is to dynamically adjust the number of active servers to optimize overall CPU usage, thereby enhancing server management efficiency and energy utilization. With the increasing popularity of online gaming, server management has grown more complex, necessitating solutions that meet player demands while minimizing energy consumption. This research focuses on analyzing server resource utilization, particularly under conditions of fluctuating player activity, and assesses the impact of adaptive management strategies on energy-saving efficiency. Through empirical data collection and regression analysis, this study establishes a dynamic adjustment system for energy savings that is applicable to Minecraft servers. The system's effectiveness in reducing energy usage is further examined under varying levels of server demand. Results show that as player numbers increase and approach the system’s load capacity, the energy-saving effect diminishes. For the servers examined in this study, once the player count reaches 35, it is no longer feasible to reduce the number of active servers without compromising performance.