If you haven't already grabbed your free copy of Portal, there's a rogue artificial intelligence that would like to have a word with you.
On Thursday, Valve released a promotional video narrated by GLaDOS that urges gamers to download a free copy of Portal for either Mac or PC and become a willing test subject in Aperture Science's experiment. The clip also alludes to the forthcoming Portal 2, due later this year, which promises cooperative puzzle solving.
Portal is a unique first-person puzzle game that Valve released in 2007. The game began its life as Narbacular Drop, a senior thesis project from a team of DigiPen students.
The free Portal offer is good until May 24. So do what GLaDOS says and push the big, red button.
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