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The Portal series of puzzle games consists of the following mainline releases:
There have also been a number of spin-off titles, including:
Machina posted 19/02/2020, 07:00
- 13.06m for Portal 2 on Steam.
- 9.97m for Portal on Steam.
- 4m for Portal at retail ( https://web.archive.org/web/20200219184518/https://www.gamasutra.com/view/news/34204/Portal_Sells_4_Million_Excluding_Steam_Sales.php ).
So it doesn't include:
- Console sales for Portal 2 (retail & digital).
- Portal retail sales from mid-2011 onwards.
- Portal: Still Alive sales.
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