S.T.A.L.K.E.R.: Priboi Story 2 is not a game, but a huge mod for the S.T.A.L.K.E.R. series. The fans and critics call it the fourth game in STALKER universe, because it is really comprehensive and exciting. If you missed the dangerous adventures in nuclear zone, then you should download S.T.A.L.K.E.R.: Priboi Story 2 for free or at its cost.