Secure Border is a sports reaction game based on a drag mechanic. The player controls a horizontal guard to block falling projectiles. Three projectiles crossing the boundary line will end the current session. Projectile speed and movement patterns vary across levels. Some objects follow curved trajectories to test reaction speed. The application contains 30 levels organized into three distinct chapters. The user interface features a light blue color scheme with neon accents and white text. Level progress and ten specific achievements are saved to the device memory.