Realm of the Mad God - Realm of the Mad God is a best online hack and slash video game that includes pixel style graphics.
Black Desert Online - This Korean developed MMORPG offers a dynamic, action-based combat system in a richly developed fantasy setting.
Runescape - RuneScape is 3D Action-Adventure, Massively Multiplayer Online, Role-playing, Fantasy-based and browser-based video game developed and published by Jagex.
NosTale - NosTale (The Tale of Nomads of Silver Spirit) is a totally free MMORPG that includes simple (but beautiful) graphics and also lots of class options.
LaTale - LaTale draws heavily from some other 2D side scrolling video games to provide a great fantasy MMORPG world.
Zombies Ate My Pizza - Zombies Ate My Pizza is a Free to Play, MMO, Browser-based, Shooter and Fast-paced video game by R2Games.