The Portal 2 interview on Video Games Daily talks with Valve's Chet Faliszek to discuss the return of GLaDOS in Portal 2, their upcoming first-person puzzler sequel. Topics include the differences between the various platforms, following up a game as tightly crafted as Portal, co-op puzzles, the relationship between the Portal series and the Half-Life series, mod tools, and more. At one point Chet explains that they are adding complexity, but not necessarily increasing difficulty: "And then it also comes with expanding the puzzles out. We didn’t want to just take the same puzzles and make them more difficult – we expand that out by giving you more to do, more complexity but not necessarily difficulty. So that you have all these different elements you have to pull in – you have hard light bridges now, you have tractor beams, you have all these different elements that you’re using in the game, and you add them all up and run with it."