So I've been playing this new game, GunBound. It's a free online game. In terms of play mechanics, I guess it's kinda like Worms, or Scorched Earth, or the gorillas-tossing-bananas game if you're really old school. But they added a little twist- you earn money and buy armor and whatnot that changes your avatar's appearance and abilities, kinda like in Ragnarok. So they added that element of having to make money to make your character better- increasing the addictiveness of the game tenfold.