Horse Isle

Horse Isle is a 2-D MMORPG created by Miranda and Joe Durbin. In the game you can create your own character, buy, care for, and compete with your own horses, do quests for NPC characters, and talk with other real people from around the world.

It's a pretty good game, and addicting at first. But beware, if you're a n00b or you don't like drama, don't play.