Massively Multiplayer Online games, or more commonly known as MMO games, are one of the most persistent genres of video games. From having a detailed world, to a massive player base that interacts and completes missions with each other, to having a functioning economy that affects all players equally, MMO games build a complete ecosystem within the title.
MMO titles also generally have ongoing lore that gets added to a persistent update cycle. MMO games usually have a subscription-based model
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