When did it switch from 'here's our test bed' to 'we're going to show this off and dial in some mission stuff as examples'?

I think this just became natural, because we wanted to make sure that if we have transitions from three ecosystems into each other, like you start off on a mountain range, go to a rocky plateau, and then into a desert, that this feels cool also if you traverse it as a player. And then we invented some kind of mission goals that you would have in the PU if you actually do this stuff, to push you through the space. And then Todd came on board and actually made sure that it's a proper PU design, a proper mission design. And it basically just evolved naturally.