AdventureQuest Worlds - AdventureQuest Worlds (or AQWorlds) is an easy but very popular browser-based massively multi-player online Role-Playing game.
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.
Dungeon Blitz - Dungeon Blitz is an Amazing, Action-Adventure, Massively Multiplayer Online, Role-playing and Browser-based video game developed and published by Blue Mammoth Games.
LaTale - LaTale draws heavily from some other 2D side scrolling video games to provide a great fantasy MMORPG world.
Adventure Quest - Adventure Quest is an Action-Adventure, Free-to-play (One Time Membership Fee) Single-player MMORPG, Browser-based and Fantasy-based video game developed and published by Artix Entertainment.
Runescape - RuneScape is 3D Action-Adventure, Massively Multiplayer Online, Role-playing, Fantasy-based and browser-based video game developed and published by Jagex.