# Kingdom Reign > Free real-time multiplayer medieval MMO strategy game playable in the browser. /home: https://clashofkings.com/ /about: Kingdom Reign is a real-time multiplayer kingdom-building strategy game inspired by Clash of Kings. Players build and upgrade castles, train armies (infantry, cavalry, artillery), gather resources, research technologies, form alliances, and battle rivals on a shared world map. The game features a persistent world with thousands of map tiles, player-owned kingdoms, alliance diplomacy, and live troop marches. /features: Castle building and upgrades, troop training and combat, resource gathering (food, wood, iron, mithril), research and technology trees, alliance system with diplomacy, real-time world map with player castles and resource nodes, item inventory and buffs, hospital and troop healing. /audience: Strategy game fans who enjoy browser-based MMOs, kingdom-builder games, or titles like Clash of Kings, Rise of Kingdoms, or Lords Mobile.