Darwinia developer Introversion's upcoming management sim Prison Architect has earned over $1 million from pre-order sales alone. Not bad for a team of seven. Who knew so many people dreamt of being prison wardens?

The current total comes to $1,016,710 out of 30,259 alphas sold. That comes to an average pledge of $33.6. The minimum amount one can buy the alpha for is $30, then $35 grants players an artbook and soundtrack, while $40 pledges come with Introversion's entire back catalogue as well as all of the above.

"What an incredible milestone! We are incredibly thankful to everyone who has joined us so far," tweeted Introversion Software's company account.

For more information on Prison Architect, our Tom Bramwell served hard time in it last October where he was kind enough to write a preview based on his harrowing exploits.