I'm still bumbling, tumbling and blundering through the cavernous labyrinths of first-person spelunking sim Lorn's ...

Heart of Chornobyl, it's worth remembering one of the earlier FPS from the GSC Game World studio. Codename: Outbreak laid the groundwork for adventures in the Zone.

The sequel, called S.T.A.L.K.E.R. 2: Heart of Chornobyl, was first announced in 2010 and postponed several times.