MMO games, also known as massively multiplayer online (MMO) video games, allow hundreds of players to interact within a shared virtual game world. Many MMOs feature virtual economies and social interactions; others may offer guilds or parties.

Network games can be found across most network-capable platforms and may be free or pay-to-play with microtransactions.

Free to play

MMO games feature immersive game worlds connected to players by servers. These worlds may be either simulated or non-simulated and may host different races, classes and other characteristics for their players to inhabit. They often also incorporate virtual economies that enable real money exchange for virtual currency.

MMO games that incorporate real-world physics into their simulation environments often provide unique and immersive experiences. These games may feature elements such as rocket science, airplanes, cars, battle tanks, or submarines while simulating industries and scenarios involving exploration, strategy, and high-risk challenges. In an  Online dungeon MMO , players can experience a different type of immersive gameplay by exploring dangerous environments, battling powerful enemies, completing challenging quests, and working together to overcome intense dungeon encounters.

Other MMOs use more graphic-heavy approaches. Examples include multiplayer flight combat games and 3D role-playing games; these titles may also be considered casual games without story or quest elements, yet still qualify as MMOs. Although these titles tend to appeal to a wider range of computer users, they require time commitment that may not always be available to them.

Pay-to-play

Pay-to-play MMORPGs typically require players to pay a subscription fee in order to play and access the game, though many also allow microtransactions for extra content or perks that players may desire in-game. Such games are known as freemium (an acronym of "free-to-play" and "premium").

Some MMORPGs do not impose limits on players' levels; however, some require specific equipment in order to compete effectively in scripted encounters and player-vs-player combat; this practice is known as grinding and drives player motivation by helping them gain higher-tier equipment.

Most MMORPGs provide tools for communication between players, guilds or clans and some roleplayers, and some players even roleplay their characters - this has led to the emergence of subcultures within these games, complete with its own language and set of unspoken social rules - these communities also possess their own websites and forums for interaction between members. Some games even boast living economies, where virtual items hold real economic value that can be traded against real currency in-game or elsewhere in real life.

Microtransactions

Gaming is an enormous industry, and microtransactions have become an important source of revenue. These small purchases provide players with better weapons, items or cosmetic upgrades within games; some games also use these purchases to unlock a special mode or character; these features may be controversial; but they've become an integral part of gaming experiences today.

Microtransaction models are popularly utilized in free-to-play games, often known as freemium or "pay-to-win". This form of game enables players to make purchases that give them an advantage over other gamers - either using real money or in-game currency - and serve to increase player engagement.

Popularity of monetisation-dependent games has raised many ethical issues about marketing them and compelling players to spend large sums of money for in-game items. Andrei Klubnikin speaks with Pavel Shylenok, CTO of R-Style Lab about challenges of monetisation for video and mobile games.

Community

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Some MMOs feature in-world virtual communities that emphasize socialization and worldbuilding over gameplay; an example is Linden Lab's Second Life, which has received extensive media coverage. Other games in this genre feature both online and real-world play with no persistent world or large player base.

Other MMOs are simulation games which replicate aspects of real world, like aviation and automobile industries, to challenge server technology and network infrastructure and draw players into long term commitments with high costs and long-term commitment from players.