S.T.A.L.K.E.R.: Clear Sky's predecessor, S.T.A.L.K.E.R.: Shadow of Chernobyl, was released early last year to a mixture of acclaim and slight disappointment. Anticipated for a long time before its release, it didn't quite meet its potential. It was annoyingly buggy, it required a high specification PC to run, and to many it felt frustratingly hard. Well guess what, it's very nearly deja vu all over again. Clear Sky certainly needs patience but there are rewards for getting through its quirks; however that doesn't necessarily mean all that play it will persevere.