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

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At least Valve doesn't turn its test subjects' blood into gasoline

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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GamesRadarTylerWilde
GamesRadarTylerWilde
Associate Editor, Digital at PC Gamer