3D Merge Defense is a free Tower Defense game that offers a unique gameplay experience by allowing players to merge cannons to defeat the Cube army rush. The game is available on Android platform and has been developed by Serina.

The game offers a variety of cannons that can be unlocked to upgrade and position tactically to defend against increasingly powerful waves of cubes and deadly bosses. The game is designed to cater to both merge fanatics and tower defense veterans, providing a familiar yet fresh and exciting experience.

Overall, 3D Merge Defense is a super addictive game that offers hours of fun and entertainment. It is a great choice for anyone looking for a challenging and engaging Tower Defense game on their Android device.