Maplestory - MapleStory is among the most popular of MMO in the 2D area scrolling style offering a user count will into the lot of players.
Secret of Mana - Secret of Mana originally released back in 1993 is a remastered version of the game.
LaTale - LaTale draws heavily from some other 2D side scrolling video games to provide a great fantasy MMORPG world.
Peria Chronicles - Peria Chronicles is an MMORPG, Anime-based Sandbox video game developed by Thingsoft and published by Nexon.
AdventureQuest Worlds - AdventureQuest Worlds (or AQWorlds) is an easy but very popular browser-based massively multi-player online Role-Playing game.
Sword Art Online: Hollow Realization - Sword Art Online: Hollow Realization is an Action-Adventure, Role-playing, Single and Multiplayer video game developed by Aquria and published by Bandai Namco Entertainment.