During your voice over session, which scene was the most challenging?
Oliver: There’s a few different pronunciations of some of the spells and some of the character names, so I think those were the most challenging bits. It was still quite cool ‘cause most of it was done through the radio – Wireless Network – so that was fun.

James: There was a problem. We had to do a lot of different variations of shouting and I shouted too loud on the one and lost my voice. So I blew it, out it went, which was really challenging to speak after that.

What’s the most difficult challenge overall to lending your voice?
Oliver:The pronunciation is the main thing.

James: I think it’s because when kind of like when you’re using green screen or blue screen because you can’t see anything. It’s just your imagination, but when it’s your voice, you’re only acting with your voice. You’re not facial or anything, it’s just your voice, so I guess that’s the most challenging.

What did you like most about the Harry Potter and the Half-Blood Prince game?
Oliver: The Wii version of it was great. With the fighting and everything, and I really enjoyed that truly.

James: I think mine was that you could actually explore the whole of Hogwarts – that was something that you couldn’t do before. So being able to do that all over was great. I think that’s what completely sets aside the Deathly Hallows, Part One completely away from all the others is because you’re no longer in Hogwarts. Like that bit that we were doing with the Kinect - that was completely different, but fun.

What new features can fans expect in the Deathly Hallows: Part 1 game?
Oliver: The main thing that I’ve noticed of it is the graphics. It’s developed for hi-def gaming now. So whereas, for example, the last game you have five light variations per shot, now you’ve got something like 1,200 - so, big difference there. So when you cast a spell, you can see the light change and everything. So that’s the main difference that I’ve noticed.

What are you looking forward to most in the Deathly Hallows: Part 1 game?
James: There’s so much game play in it and everything, it’s incredible. I think the fact that you can use the Invisibility Cloak a lot more in this one. And so you sneak up behind Death Eaters and Snatchers and then cast a spell on them in that way. And that brings a whole new element to the game. As opposed to instead of just like in the Half-Blood Prince you were making potions and mixing them. In this game you’re throwing potions and all that kind of stuff. So yeah, that different element.

Oliver: The thing I’m looking forward to is just being able to play more on the Kinect software . That was so different, so unique. I’d like to play on that more. For a game like Harry Potter fits perfectly with it.

How long did it take to record your voices?
James: About three or four days in total. It shouldn’t have been that long, but I lost my voice. I didn’t realize I’d done it until like we did all the screaming and I had a couple of lines to do after that, but my voice was just like, “Ehhh, ehhhh.” It was weird. So that’s why it took longer than it should have done. But I don’t think a lot of people were complaining that I couldn’t speak afterwards.

How many hours per day were there?
James: About seven or eight. We had breaks in between, obviously. But, yeah, about seven or eight hours.

How does it feel now, having done the characters with your voices, knowing that thousands of kids will play the game?
Oliver: It feels to me like the same as when you’ve made the film. You know a lot of people are going to watch it but you don’t know suspect how many or what it’s going to be. But we’ve had a great insight in doing these games as to how games are developed and made. It’s fantastic – so excited to be able to do it.

You’ve been to Germany before, to promote the Half-Blood Prince video game. How do you like it?
Oliver: Yeah, good! It’s cool to be in a different city, as well. Leipzig was cool and it was a different place to where we probably would’ve probably gone to, but they were really nice there. It’s good to be over here in Cologne - had a good look around the other day. It’s nice. It’s always cool coming to Germany because there’s such a cool Harry Potter fan base there. It’s really good.

Which is your favorite Harry Potter videogame from EA so far?
James: I think this one, to be honest with you, simply because it’s no longer passive. It’s a proper third-person action game, which is a lot more my kind of game in general. There’s a lot more thinking you’re way around it. I’d say this one.

Oliver: Yeah, I’d have to say the same thing. Before that, if you go right back to the beginning, one of the games was the Quidditch World Cup.. That was great fun, that was really fun.

James and Oliver Phelps (who we’re sure you recognise as Fred and George Weasley from the Harry Potter films) joined us at Gamescom in Germany to showcase the ‘Harry Potter and the Deathly Hallows – Part 1’ videogame.