Castle Empire is a free-to-play strategy game developed by HaoPlay Limited for Android 13.0 and above. The game is set in the medieval era, where players take on the role of an alliance leader competing against the forces of the old empire with other players. The game offers a unique castle feature that allows players to assign every castle room, train residents, and build their own dream castle.

One of the game's highlights is the casual tower defense gameplay, which is currently available in single-player mode. Although the gameplay is casual, it still offers strategic depth and requires certain finger flexibility. Players can also enjoy real-time combat control, with RTS large-scale map combat control, freely switching between marching and combat, multiple teams fighting simultaneously, flexible tactics, and real-time operation, making the battlefield situation ever-changing.

Overall, Castle Empire is an engaging medieval strategy game that offers unique castle-building features, casual tower defense gameplay, and real-time combat control. The game is free to download and play, making it accessible to all strategy game enthusiasts.