Prison Architect has already earned $19M, and it doesn’t release until next week

It’s rare to find a game that’s a financial success before it’s even launched, but Prison Architect is a great example of the early access sales model.

The prison simulator officially releases for PC on October 6, and developer Introversion Software has already earned $19 million from it, reports GamesIndustry. Prison Architect first came out in a paid alpha form way back in September 2012. Since then, it’s sold over 1.25 million copies during its ongoing development, via Introversion’s own website and, more recently, the Steam digital store.