Prison Architect has already earned $19M

So the indie age is over, huh?

Prison Architect has generated a whopping amount of revenue from 1.25 million sales, Introversion has revealed.

Founding director Mark Morris told Eurogamer that the sim had brought in $19 million as of September 26 - well in advance of its official launch next week.

Introversion first put Prison Architect on sale in September 2012, starting at $30 for access to the first alpha version but offering Kickstarter-like reward tiers up to $1,000.

It raised $100,000 in just three days. Three years and 36 alpha builds later, the project's success has brought the developer back from the brink of bankruptcy. It's now "very, very healthy" with former team members able to return full time.

Introversion intends to continue supporting Prison Architect for the foreseeable future, although after five years on one title Chris Delay is looking forward to transitioning to something new while the rest of the team carry on his work.

A Surrey indie, Introversion is responsible for a number of terrific games including Darwinia and Uplink. Congratulations to the team on this success.