Castle Duels: Royal PvP Battle is a real-time, merge-based tower defense strategy game that pits players against one another in competitive PvP arenas. By combining traditional deck-building mechanics with a unique "Battle Boost" system, the game offers a tactical layer that differentiates it from standard tower defense titles. It targets midcore strategy enthusiasts who enjoy high-stakes, fantasy-themed combat and social clan integration. While the game successfully captures an addictive core loop that avoids forced advertisements, its market position is currently volatile. The title faces significant challenges regarding technical stability and a polarized player base frustrated by aggressive pay-to-win mechanics and unbalanced matchmaking.