Yes, online games are a goldmine for developers. Imagine releasing a game once, only to keep making money off it for years, or even decades? It sounds like a great deal. The only problem is that making an online game players will keep wanting to come back to isn’t easy. In fact, it’s very difficult, so much so that failure is more likely than success.

This gamble doesn’t stop big studios from trying, though, often resulting in enormous flops. These are online games that big studios attempted to make, only to produce a failure that shook the entire industry.