Yep.
Idem pour ceux qui ont inventé les gels utilisés dans Portal 2 : https://www.digipen.edu/studentprojects/tag/
Et ils viennent de la même école de game design que les créateurs de Narbacular Drop (d’où le même URL en digipen.edu, qui est justement ladite école ).

http://en.wikipedia.org/wiki/Narbacular_Drop After the release of Narbacular Drop, Valve, developers of the Half-Life series, discovered it and hired the entire development team to work for them. The team developed Portal, a spiritual successor to Narbacular Drop, using the same basic concept.

http://en.wikipedia.org/wiki/Tag:_The_Power_of_Paint Since the release of Tag, the programmers have been brought on as developers for Valve Corporation. Their work was incorporated into new puzzle elements involving the paint concept into Portal 2, in a similar manner that another DigiPen project team, Narbacular Drop, was brought into Valve with their work forming the basis of Portal.