Fantasy Realm Online is a game engine being developed by Seamless Network Systems combining 2D isometric programming with 3D features. Moon Haven, Seamless Network Systems' premier game world, is an online RPG that offers quests, PvE and PvP combat, and the ability to choose between the factions of Good and Evil, which will affect players' skills, benefits, and stories.

Fantasy Realm Online: Moon Haven is free-to-play, although players can pay one-time upgrade fees to increase their in-game character and property-owning limits.