Might and Magic: Heroes Kingdoms is a real-time strategy massively multiplayer online game played through an Internet browser. Different game worlds are available, each of which can hold a limited number of players. Each game world consists of a tiled map of regions. Players choose a game world to play on and each is given control of a city within one of the regions. Each region is itself made up of a 25 zones (5 by 5 tiles) with the city at the centre. Four of these zones contain mines which provide resources to the city while others are open ground. Each zone in a newly acquired region is populated with an army of non-player character (NPC) troops which must be defeated before mined resoures can be collected or before buildings can be constructed on the open ground.
The city houses a hero character and the player's troops. Structures can be built within the city to enable the hiring of new heroes, the training of additional troops, the researching of spells, and to provide other bonuses. Heroes can lead troops into battle, can improve mines and construct build buildings in the zones surrounding a city, and can establish new cities in other regions. They gain experience points from performing these actions and, as they level up, can learn trades and skills to boost their performance in battle or the city's economy.
Players must organize themselves into alliances for protection and to obtain the "Tears of Asha" which are required to win the game. Each game last approximately 6 months and players can then start a new game and receive bonuses in the new game world based upon their achievements in the previous game world.
The economy of the game requires the collection of gold, common resources (ore and wood) and rare resources (mercury, crystals, sulfur and gems). Gold is used to recruit and maintain heroes and troops, and to pay for structures and buildings. Common resources are required to build basic city structures. Rare resources are required for specialist and magical structures and to recruit high level troops. Since each city has only four mines, other resource-types must be purchased or looted. Trades can be made with other players or with an NPC merchant. As players establish new cities in regions with a different set of four mines, they become increasingly self-sufficient.
Each player is one of four races, Haven, Academy, Necropolis and Inferno. Each race has different skills in combat and magic and requires different rare resources for their respective specialist structures and troops.
Source: Wikipedia, "Might and Magic: Heroes Kingdoms", available under the CC-BY-SA License.