A recent interview with Erik Wolpa, lead writer for "Portal 2" at valve, on the UK version of the Electronic Arts website reveals that a new Gel feature didn't make it into the final version of the game because it was so disorientating.
"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."
You can read the entire interview at EA.com/uk
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