Been digging through more of the GSC game world STALKER assets.

Found this multiplayer test map known as Circus, its within the object files for STALKER Clear Sky.

For Shadow of Chernobyl there's a few early versions of the levels in a folder named !!!_For_Delete.

Such as this version of Lab X-18 with a slightly different layout (I believe this is the same layout as the version featured in XRcore Build 1475.)