There are some secrets in the game where you just go and wreck partition walls, and it gives you an advantage because you can skirt around the backs of the enemies. We're using [the environment] as much as possible. We didn't want to make a game where, you can just kind of shoot through the floor and make a huge floor and just keep going until you got to the end [of the level]. We just wanted to make something that was just really cool and exciting and destructive, and where possible, we could [allow for] the destruction to hurt your enemies any more.