This game controller can be used in connection with a smartphone. Showcasing round curves, it is in a unique form that ensures a comfortable grip. By attaching a device, the user can enjoy various games more dynamically. The key controls have enhanced usability and feature an iconic layout. An ergonomic curved slide was adopted in consideration of users. The device can be placed in a stable, balanced way. Also, the user can view the screen at an optimal angle, resulting in a comfortable usage environment.