Portal 2 would have contained a wall-walking gel were it not so nauseating

Based on comments made throughout the development of Portal 2, it's apparent that Valve's process includes the conception of and testing of a slew of ideas, many of which are eventually scrapped (it even discussed music-based puzzles at one point). According to lead writer Erik Wolpaw, who recently spoke to EA in a brief interview, one of the Portal 2 ideas which made it to testing was a gel, like the bouncy Repulsion Gel, which allowed players to walk on walls. Unfortunately for the cool idea, it was too disorienting for Valve's test subjects.

"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," said Wolpaw.

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Associate Editor, Digital at PC Gamer