RPG is a genre where you play a hero or a group of heroes who are involved in some sort of adventure and can advance their abilities as a result of gaining experience. There are different gameplay settings for an RPG. It can be fantasy world with swords and magic as well as high tech space adventure in some distant future. General game rules are the same — you play, you do progress, you became stronger. And usually it takes huge amount of time to become really good. In fact the games listed here are not just RPG, but MMORPG. MMO — means “massively multiplayer online”. However, almost all IO games are MMO-games, so we just said it short.