The maximum security prison builder released in alpha form in late September 2012, offering various tier rewards for backers. It also became one of the first Early Access titles on Steam.
Today Prison Architect is up to Alpha 10 which added prison riots as each inmate has a 'boiling point' attribute that, if reached, will send them off on a rage.
You can still pledge your monies to help design new ways of keeping our society’s most dangerous locked away, and maybe even giving them a chance to rehabilitate themselves? Of course you could always push them around. As more alpha updates release Introversion is adding more and more new mechanics for testers to figure out and master.
Visit theto considering pledging or Steam's Early Access - either way gets you alpha builds.