EA News has posted a new interview with Valve's Erik Wolpaw. The lead writer for the company's recently released action puzzler, Portal 2, discussed the origin of the game's concept, discarded ideas, and difficulty level.

What other ideas came up for Portal 2 that were eventually cut?
At one point we had a new Gel that allowed players to walk up the side of walls. While this added a new twist to the game, the effect was so disorientating that it made people nauseas.

While working on a first-person game you always have to be aware of that issue so we removed that Gel. We also made changes to frame rate and movement that will help anyone play Portal 2 even if they do experience a feeling of nauseas while playing other first-person games.

How does the story line for the co-op mode of Portal 2 differ from the single player? Were they equally difficult to write for?
The co-op story is a little different to write for because you have two people playing and they will have their own story. They will walk away not talking about the trials and tribulations of Atlas and P-Body but instead laughing about what they did to each other. So the story needs to give space for their story to breath next to the game’s story.

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