It's some game on ArmorGames I just picked up. Three people join together as a Warrior, an Archer, and a Mage and they defend a castle against waves of enemies. I think the goal is to see how many waves you can get through. I don't know, I just started playing it. It feels like it has potential, though.
http://armorgames.com/play/12546/the-last-castle
If you click on multiplayer, it should prompt you to log in or sign is as a guest. If you sign in as a guest, that's fine. Whatever. I allowed guests in my game. You should see "snowpork's Game" and the password is "b8"
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http://img.imgcake.com/Ainoxi/zazigifed.gif