According to Valve, Portal has sold four million copies on various platforms. This excludes sales numbers from Steam too. Portal was sold as part of The Orange Box on Xbox 360 and PlayStation 3 which includes Half-Life 2, Half-Life 2: Episode One, Half-Life 2: Episode Two and Team Fortress 2. Portal was also released as a stand-alone retail release for PC, and as a digital download for Xbox Live Arcade - Portal: Still Alive.
Portal 2 was released yesterday on various platforms. Most critics adore the game, but some users take issue with the length of the game. That aside, it looks like Portal 2 will be another big seller for Valve and its distribution partners. Portal 2 is the first Valve game to feature PC-style Steam functionality on a home console as well as a nice bonus: those who purchase the game for PlayStation 3 can unlock a Steam Play copy of the game for free simply by linking their PlayStation Network accounts with Steam.