Last week, Garry Newman tweeted a sales chart that backed up what we already knew: that his game Garry’s Mod is extremely successful and that its sales have not slowed down since its release back in 2006. The extra detail was a little surprising though. July 2013 was the game’s best month ever in terms of copies sold, the number of copies sold doubles each year, and it has sold 3.5 million in total since launch.

Even accounting for Steam sales, those are remarkable numbers. I emailed Garry to ask him how this has happened, and also why, and also how, and what? Fwuh?
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