Return to the Zone in S.T.A.L.K.E.R: Wormwood, a high-difficulty survival-oriented realism modification for GSC Game World’s S.T.A.L.K.E.R: Call of Pripyat. Wormwood builds upon the core Stalker experience, enriching the latest in the cult game series with brand new survival mechanics, intense and realistic gunplay, new missions, levels, fleshed-out building interiors and much, much more.