Call of Duty 2

Eurogamer: Call of Duty was obviously an enormous success, and still stands out as one of the most evocative and engaging first-person shooters we've seen. We've noticed that you've done away with health packs, but what aspects of the original have you maintained?

Grant Collier: The cinematic intensity. The large-scale infantry battles, having a hundred a side. The multiple storylines. Different perspectives. Oh, and a really great multiplayer game. We spent a lot of time on CoD1, making sure we had a real streamlined and robust multiplayer. I've played 64-player games of multiplayer CoD, which is amazing. So we wanted to make sure we had that streamlined and rich experience - we wanted to keep that type of clean net code that would support clan gaming for those who want to play competitively.

Eurogamer: So with all that in place, what's changed?

Grant Collier: Some big changes from CoD1 to CoD 2 came from the feedback from consumers. We asked, and they said they didn't necessarily like the style we did for the British campaign - it was solo or with a small squad - and they really liked the Russians and they really liked the Americans. But with the Brits, they felt like they'd already played that game before - they'd already played the one man, Rambo, going through the war single-handedly. Now the British campaign is heavy infantry fighting, and not special ops any more.

Eurogamer: And there are some tactical changes too, right?

Grant Collier: Yeah, we also got together with our military adviser, Hank, and asked him what was missing from CoD1. He said that first off, it's too quiet out there. The guns are blazing, and the planes are flying overhead, but in a battlefield, once the first shot is fired, there's a lot of chatter. We've created a context-sensitive battle-chatter system. They can see their friends and foes, and they're going to call that information out to their allies. "I'm out of ammo." "I'm wounded." "Back me up." The enemies will do the same, relaying information about where you are. The other thing he said was missing was portable concealment, part of warfare for several hundred years.

Eurogamer: Portable concealment?

Grant Collier: Portable Concealment is basically smoke. We've created our own proprietary system, no longer using the Quake 3 system, that will allow us to have smoke grenades which are used throughout the game, changing the tactics you use. When explosions go off, it's not just a puff of smoke that appears and is then gone. There will be a brilliant explosion, and then smoke billowing, and smouldering. Adding smoke has so dramatically changed the way the game plays. You'll be having a fire-fight, when suddenly a soldier will throw shit-loads of smoke grenades at you, and all these guys come rushing through the smoke and rifle-butt you down. Heh, melee is very lethal in the game.

Eurogamer: You mentioned that you're no longer using the same engine. What made you decide to create something yourselves?

Grant Collier: When we started designing CoD2, we tasked the designers with taking the experience to the next level. They came back to us saying, "We're going to do non-linear gameplay." We said, "Hey, great idea," and set out to see how we could make the game, and realised that we couldn't use any of the stuff that we'd used before. It was worthless. Before, we always knew where the player was going to be, and there were never going to be any enemies behind you. You followed a little path, and maybe it was a great ride, but the AI always knew where you were, would always point their gun in a certain direction, and certainly didn't need to be as smart as they are now.

Eurogamer: They seemed a lot cleverer. We were quite thrown when they started playing tricks on us.

Grant Collier: Now they have vision cones and hearing ranges - they're very autonomous. They have extensive knowledge of what can be used as cover, what the level layout is - they need to know everything about the level when they're moving around. When you're attacking the Germans, and they're pressed, they'll fall back and retreat. Then they'll try to set up ambushes. When they move around to flank you, if they come across other friendlies they'll tag them and bring them with. Once they find you, they'll relay that information to their fellow soldiers. If you speak German, you'll hear them say, "They're over here, let's flank them."

Eurogamer: So that explains the non-linearity within the levels, giving the opponents the capability to cope with your improvising, but what about the missions' non-linearity. How does that work?

Grant Collier: You start in 1941 with the Russians, defending Moscow from the Germans. You can move through a story-driven path all the way through the Russian missions, or, as you hit 1942 you unlock the British infantry campaign in North Africa, then in 1943 you open up the British tank commander campaign in N Africa. Then 1944 starts off with the Americans on D-Day. You can jump back and forth through these campaigns, as long as you unlock them chronologically.

Eurogamer: Something that probably most stood out to us when we played CoD1 was the astonishing emotional honesty. Killing people hurt, and when it stopped hurting, noticing that hurt worse. You seem to actually give a shit about the subject matter - where does that come from?

Grant Collier: We spent a lot of time talking with veterans. From day one, we always wanted to be extremely respectful of what those people went through, the sacrifices they made. It totally shaped the Western world. We've always wanted to talk to the veterans and bring them and, and we have a lot of pride in what we do. We've never once had a veteran tell us that he was ashamed of the fact that we were making this game. That's a real honour. It's been a real honour to tell their story, and to do it in a tasteful fashion.

Eurogamer: Obviously it's been exciting to see CoD2 running on 360. It looked pretty awesome, something that can't have been that easy to achieve on brand new tech.

Grant Collier: The 360 - it's like this whole new era of gaming. This probably would have been a PC-only title if Microsoft hadn't come to Activision and asked Infinity Ward to do an exclusive for the 360. That was a real honour - we've had a great relationship with them. They've been able to help us out tremendously. But multiple threading - that has been a really challenging thing. I don't want to blow any smoke your way, but it has been challenging.

Eurogamer: So how on earth do you go about meeting that challenge, especially with the pressure of being a launch title?

Grant Collier: At IW, we try to tackle the riskiest, most difficult things first. We allocate a certain amount f time in the beginning, and that's when we start beating on that shit, and if it's not working at the end of that time, then we know we're just not going to deal with it and move on. But when we do get it working, we have the entire development period to tweak it and make it better. And the multi-threading stuff, now we have it working, we're running at 60fps on the 360, which is very nice.

Eurogamer: Do you think there's an audience out there equipped to take full advantage of the 360's framerate and hi-def output?

Grant Collier: Well, I have a real pimped out home entertainment system. I've got a 60 inch plasma screen, and surround sound, and gigantic sub woofer, and it's begging for 5.1 games, and for hi-definition games. The games look so much better than everything else that I'm used to. It really is next generation.