There's a video interview on 1UP talking with Erik Wolpaw and Chet Faliszek at Valve's offices to learn more about Portal 2, the upcoming platformer sequel. There's behind-the-scenes footage at Valve's cool digs and word on a competitive multiplayer mode that was dropped: "Along with co-op, [we had] the idea of sort of a competitive Portal multiplayer," says Wolpaw. "We went down that path, actually, for a little while and had something up and running -- the best way to describe it is sort of speedball meets Portal. You know, a sports analog. And it quickly became apparent that while it's fun for about two seconds to drop portals under people and things like that, it quickly just devolves into pure chaos. It lost a lot of the stuff that was really entertaining about Portal, which was puzzle-solving. Cooperative puzzle-solving was just a much more rewarding path."