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.
Ys: Memories of Celceta - Ys: Memories of Celceta is a Fantastic Action-Adventure and Fantasy-based RPG video game by Nihon Falcom Corp.
LaTale - LaTale draws heavily from some other 2D side scrolling video games to provide a great fantasy MMORPG world.
Kameo: Elements of Power - Kameo: Elements of Power immerses you into a brilliant game-play that offers the amazing combination of Action-Adventure and Fantasy RPG elements.
AdventureQuest Worlds - AdventureQuest Worlds (or AQWorlds) is an easy but very popular browser-based massively multi-player online Role-Playing game.
Secret of Mana - Secret of Mana originally released back in 1993 is a remastered version of the game.