World of Warcraft, free to play and ready to take over your life!
The folk's over at Blizzard are making their biggest game free to play. Everyone and their grandmas can now join to the addiction. People who have free to play accounts can only reach level 20, this is a very sly way for Blizzard to get more people into WoW.
I'm going to be completely honest here, for one whole year I was addicted to World of Warcraft. When you play it's all you think about, it's all you want to do and it's all your going to do. Fair warning to those wanting to try it out, WoW is addicting.