Near the end of 2007, I went to Budapest to the newly-opened Crytek satellite studio to give the Level Designers there hands-on CryEngine training. After shipping Crysis, it was announced that they were looking for people to go to Budapest to work on the Crysis expansion and having already fallen in love with the city, I jumped at the chance.
Working on Crysis Warhead was really fun! Since we already knew what had been well-received in Crysis (and what hadn't) it was all about cranking up the dial on what worked and spending time plugging the holes.
Large AAA productions involve a lot of people who contribute to the game and the level, the work you see below is the hard work of an entire team.