S.T.A.L.K.E.R.: Clear Sky developer GSC Game World is conflicted, and it shows. The recent announcement that their previous first-person shooter S.T.A.L.K.E.R.: Shadow of Chernobyl sold 2 million copies worldwide promises a bright future for the brand, but it also raises difficult questions about how to move the series forward. With more developers reaping financial rewards from populist game design (see: Team Fortress 2, Spore, and, to a lesser extent, BioShock), it stands to reason that GSC may follow suit with the S.T.A.L.K.E.R. franchise -- and they have, to some degree. But the changes in Clear Sky are contradictory at best: Some oversimplify to the point of absurdity, while others encourage exploration and risk-taking.