"The X-Ray Engine is the name of the 3D game engine created by Kiev-based computer game developer GSC Game World. Released on 20 March 2007, the engine is used in the first three S.T.A.L.K.E.R. games released by the company. An upgraded engine was planned for the cancelled game S.T.A.L.K.E.R. 2."@en . "X-Ray Engine"@en . . "Version 1.6" . . . . . "Updated when a new game comes out that supports the X-Ray Engine" . .