"GNPC: So was the expansion back motivated by continuing the story, or was it about content that you couldn't fit into the original game…?

Matt Hooper: There wasn't a whole lot of a conscious effort to say, 'Hey, we can't fit this in DooM 3, let's move it over to the expansion. There probably are a couple of things just by default that worked their way into the expansion because we thought it worked better. Like some of the weapons, for instance. DooM 3 has such a huge arsenal of weapons. It's like, everything ever created. There's, you know, a couple different machine guns, and there's plasma guns, there's projectile weapons, there's rocket launchers--there's just everything. There was no room to fit other things.

So when we started talking about the expansion, that's why we added things like the grabber weapon that throws back the enemies' projectiles, because we thought that was new and fresh, and we didn't want to just introduce some new machine gun, or something like that. There was a lot of clamoring for the double-barreled shotgun in DooM 3, so we had to add that back in there. But there wasn't this holding back of things that we didn't want to do in DooM 3. It was more just, 'Hey, let's do what's cool for the expansion.'"