Blogshares - I played blogs shares for more than a year, got myself into the top 50 rich players but stopped then they changed some rules in the game which i think they made it to gain more money than by making the players enjoy. there was also a bug on the game which made a major roll back. that was enough to convince to stop playing. i still have my account though i think my chips are gone, i lost the interest in playing so every blog i moderated is approved.
Neopets - I still play neopets from time to time. I dont find it boring, even if the target audience are supposed to be elementary kids but i think alot are adult players. Lots of built in games to choose from not to mention the battle dome wherein you could challenge neopets players to fight against your neopet.
Adventure Quest - Its been almost 3 years since i last played Adventure Quest. I only played this game in about 4 months. the free version is very hard to login. it made me decide not to continue playing. My character just reached level 40 when i stopped playing.
Tribal Wars - I was addicted to this game. it made me stop working, blogging, even skip meals, and other online activities. it was almost a year when i realised how i became and eventually stopped. i missed playing TW. I cant go back anymore probably because my villages may already be overruned. I managed to raise my points to 400k when i stopped playing. If i were to recommend which game i like the most, my answer would be tribal wars.
Unification Wars - Its a game similar to tribal wars but its setting is in space. The reason i stopped playing unification wars is that its too hard to comprehend and is very hard to manage. I mean we could read the documentation but i cant bear its complexity as i could compare it to tribal wars.
Don't forget Desktop Tower Defense. It's ridiculously addictive.
Have you ever listen about the multiplayer game online . You can play these games without pay on the internet.Glory of Fellowland (GoF) is a browser based multiplayer fantasy & strategy game placed in the middle-ages.try it out.Its quiet interesting.