What has been the most challenging thing to change with CryEngine so far?

What's a CryEngine? Yeah, well, technically, Lumberyard. We say Lumberyard now. And really, to answer the question is tricky because there's just so much different. And I say it all the time. A lot of the guys come up to me and they're like, yeah, you kind of know stuff. I'm like, hey, I used to know stuff. I used to know lots of stuff about the CryEngine, but so many things have changed on the way into it, just to be able to do the game the way we want to do it, of course, and the way the players want it, too.