Runic Games recently announced on its Twitter feed that the addictive Diablo 3-esque "click everything until it's gone" Torchlight 2 has sold over two million copies since its release last September. Victory dance commence!
If the math we just asked our cat to do is correct, that's an average of over 6,000 games per day. For an indie studio that number is beyond good. In fact, we might even say it's "really good". The first million sales came before the end of 2012, but with Steam discounts and continued support by the developer, the next million game came within six months of that milestone. By comparison, the original Torchlight's sales figures are in the hundreds of thousands.
We're going to go out on a slightly biased limb and say one of the (many) reasons Torchlight 2 sold so well compared to the original was the addition of six player online co-op. Good ole peer pressure probably turned a lot of heads when word of mouth buzz started to rise. When the full realization of epic loot quests and monster killing with friends really sank in, everyone had to jump aboard. And for good reason!
Runic was quick to thank the vibrant Torchlight 2 community for the game's continued success. It's received a lot of support from modders who have tweaked and hacked and edited things every which way. Runic has supported this wholeheartedly, even releasing the full-featured GUTS editor just a few months ago. See? Modders can do much more than just create nude patches.