Runescape is a big online game...
I played for a year but I got addicted so I stopped playing it.
The game is made by Jagex and is very popular, but remember that if you play it´s very easy to get addicted so watch out.
Don´t play more than an hour or two each day or you will become an addict.
Jagex message: Runescape is a fantastic world, but the real world is greater.