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Number of employees
The company was founded in 2001 by three friends, Chris Delay, Mark Morris, and Thomas Arundel, who met as undergraduates at Imperial College London. The company originally labelled itself "the last of the bedroom programmers" due to the trio working out of their homes - they moved into an office when working on their fourth game, Multiwinia. Their first released video game, Uplink, was programmed and designed almost exclusively by Chris, while Mark and Tom handled marketing, materials and the other business elements. Their small initial investment enabled them to buy CD-Rs and printer cartridges. Early copies of the game were handmade. The company was able to fully make back their investment within a few hours of accepting orders. A large community formed and the team, along with a new programmer Andy Bainbridge, started work on two new games.
Darwinia was released to much critical acclaim and was eventually re-released via Steam on 14 July 2005 On 29 September 2006, Introversion Software launched its third game, DEFCON. Shortly after, Introversion had measured their bandwidth in terabytes for the first time. After the release of DEFCON, Introversion began work on a game called Subversion. Their next game, however, was Multiwinia, a multiplayer follow up to Darwinia, and was released on 19 September 2008.
Subversion delay and Prison Architect
After the release of Multiwinia in 2008, Introversion announced the commencement of working on a game called Subversion in December of that year. This was followed by a series of blog-posts about the development of the game and its procedurally generated urban areas and the game was shown at the World of Love event in 2010. In October 2011, after three years in development, Subversion was announced as delayed.
Their new game was announced as Prison Architect during the Humble Indie Bundle release of Introversion games and tech demos of Subversion material, along with a treasure hunt of information on the new game hidden within the tech demos.
Financial history and independence
After a low-key launch, Uplink was a critical and commercial success for Introversion. A visit to E3 2002 saw the team "rinse £10k in a week on speedboats and fast cars", but regret soon set in as they watched their income steadily decline, since "in the games industry, you make 75% of your total revenue for the product in the first 6 months". By December 2002, then-publisher Strategy First had stopped paying royalties for Uplink; they would later file a Consumer Proposal, but were acquired by Silverstar Holdings in early 2005. Even with the cash flow from direct sales, Introversion ran out of money in the middle of 2003. The company hovered on the edge of bankruptcy, with the team selling most of their worldly goods, as their second project and only hope for funds -- Darwinia -- "slipped relentlessly".
Darwinia was eventually released in March 2005, but despite a strong opening weekend, sales soon slipped too low to sustain the company. Within six months, the developers were back on UK government benefits until November, when they contacted Valve Corporation "on a whim" to try to set up a digital distribution deal on their Steam platform. Valve responded enthusiastically and, following a 14 December 2005 online launch, digital sales, which exposed the game to a new, global audience, kept the company going through to the release of their third game, DEFCON.
On 15 September 2006, the day DEFCON pre-orders were made available, Introversion spent their last £1500. Fortuitously, the game "did much much better than [they] ever imagined" and funds for at least the forthcoming twelve months quickly rolled in to replace it. Seemingly financially secure, the company place their eventual success largely at Valve's feet: "Steam has made Introversion a commercial success", Tom Arundel is quoted saying.
By early 2010 the company was back in financial trouble. After spending over a year porting Darwinia+ to the Xbox 360, the game was not successful at launch. "It just really bombed. We missed the entire audience, I think", director Mark Morris said. The launch was in fact so poor, the company was able to tell in the first 10 minutes that it would not make enough money to save the company. At this time the company was so deeply in debt that by continuing operation the Directors faced criminal prosecution under UK insolvency law. "Tom (Arundel) spent a lot of time in those final days genuinely convinced that we were trading insolvently, probably trading insolvently, which is a criminal offense. So he was arguing that we needed to stop immediately, completely down tools, or there was a very real possibility that we would face prosecution".
Slowly Introversion's finances changed again. In Q3 2010 the company was able to add Steam achievements to DEFCON which resulted in the game being prominently featured in a sale. Morris credits the $250,000 generated by the Steam promotion as saving the company. Later, Introversion's games were featured in a Humble Indie Bundle that launched in November 2011. The "Humble Introversion Bundle" sold 190,261 bundles and generated $779,026.33. Introversion used the money for the ongoing development of their next game, entitled Prison Architect.
As of 26 September 2015, Prison Architect had grossed over $19 million in sales, and over 1.25 million units of the game had been sold. By the end of August 2016 when the final version '2.0' of Prison Architect was released, the number of individual players was given as two million.
In January 2019, Introversion and Paradox Interactive announced that the Prison Architect IP was being sold on to Paradox for an undisclosed fee, so that Introversion could concentrate on new projects while Paradox continued to support and expand on the property.  This announcement contrasts with Mark Morris' notorious statement in his acceptance speech for Darwinia at the 2006 IGF awards that, "We didn't take any money from publishers because we didn't want anybody fucking up our game". Crucially in this case however, the deal was made with a publisher after Introversion had already spent years developing and supporting the game and announced that it was a suitable time for them to relinquish control, rather than sacrificing creative control up front.
- Uplink (2001)
- Darwinia (2005)
- DEFCON (2006)
- Multiwinia (2008)
- Darwinia+ (2010)
- Prison Architect (2015)
- Scanner Sombre (2017)
- Subversion (cancelled)
- Chronometer (optioned but not developed)
- Wrong Wire (cancelled)
- Order of Magnitude (cancelled) 
- "Introversion Software . About Us". Introversion.co.uk. Retrieved 3 February 2014.
- "Darwinia on Steam".
- "Introversion • View topic - It's all in your head, Part 1". Forums.introversion.co.uk. 19 December 2006. Retrieved 3 February 2014.
- "Subversion Unveiled". Rock, Paper, Shotgun. Retrieved 3 February 2014.
- "See Subversion At World Of Love". Rock, Paper, Shotgun. 30 November 2010. Retrieved 3 February 2014.
- "New Introversion Project, Subversion Delayed". Rock, Paper, Shotgun. Retrieved 3 February 2014.
- "Introversion HumBundle And Hunt Updates". Rock, Paper, Shotgun. 30 November 2011. Retrieved 3 February 2014.
- "Becoming a proper company....," Tom, Introversion staff.
- "Introversion talk Steam". The Steam Review. 15 July 2006. Retrieved 12 April 2007.
- Hyman, Paul (March 2007). "State of the Industry: Digital Distribution". Game Developer. CMP Group. p. 14.
- "That which does not kill you..."
- Gillen, Kieron (23 August 2010). "How A Steam Promotion Saved Introversion".
- "Introversion • View topic - Number of players : Doubled". Forums.introversion.co.uk. Retrieved 3 February 2014.
- Purchese, Robert (30 September 2015). "Prison Architect earns $19m from 1.25m sales - but what's next?". Eurogamer. Retrieved 30 September 2015.
- "Paradox Interactive acquires Prison Architect from Introversion Games". VentureBeat. 8 January 2019. Retrieved 23 January 2019.
- "'Last of the Bedroom Programmers' Announce Multiwinia on PC" from Introversion's press release Introversion Announces Multiwinia, 27 February 2007, 2:57 p.m.
- "Welcome to Paradise - Introversion".
- "Darwinia+ XBLA Xbox Live Arcade".
- "Scanner Sombre - Introversion".
- Welsh, Oli. "Rezzed Sessions: Why Subversion sucked and Prison Architect won't". Eurogamer.
- "Chronometer - Introversion".
- "Wrong Wire - Rock, Paper, Shotgun - PC Game Reviews, Previews, Subjectivity".
- "Order of Magnitude". Rock, Paper, Shotgun.
- "Introversion has stepped away from Order of Magnitude, but the game's DNA lives on in next project". PC Games Insider.