Citation :
After the release of Tag, Valve discovered it and hired the entire development team to work for them, and include the paint concept in Portal 2.[1] Before Portal 2, they also worked on Left 4 Dead 2.[2]
Another game created by DigiPen students, Narbacular Drop, released in 2005, also dragged the attention of Valve. The whole team was also hired to work for Valve, which resulted in Portal.
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