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In the world of free-to-play, popular game styles seem to come in waves. After FarmVille, every Facebook developer went through their farming phase. After Social City, every social gamemaker thought they could make the next SimCity-lite. And back in those early days - wedged somewhere between virtual pets and restaurant simulations, the social scene had a brief but noteworthy obsession with treasure hunts.

In a nutshell, games like had players "exploring" a piece of land by clicking on different squares in an attempt to find all sorts of goodies. It was simple to the point of silliness, but it also managed to have that "just one more time" hook that only the most popular free-to-play games can muster.