Just to get you guys up to speed: the potentially game-breaking problem we're having is with the lighting (or lack thereof) in the subway tunnels. It only appears to occur on some computers, mainly laptops. So if you're playing the subway level and the tunnels are completely dark, you've fallen victim to this stubborn glitch. But have no fear! We're working like house elves to put it right. ːsteamhappyː
Also, if you've played Johnny Graves before, you'll have to get to the level via Level Select, which you'll find in the menu.
We'll let you know when we've conquered the bug!