This is not a standalone game (see product description)
From the Publisher: Expand Your Heroes of the Nam with X-Maps What are the X-Maps you ask? X-Maps simply put are larger maps able to be used with our Lock 'n Load Tactical game series. X-Maps are the same as our standard maps in every way except they are comprised of larger hexes, which contain nearly twice the area of the standard hexes. X-Maps are 11" x 17" in contrast to the 8.25" x 12.75" dimensions of the standard maps. Requirements: Heroes of the Nam is required to use this product.
Lock´n Load Tactical System Heroes of the Nam X-Maps Expansion - B0795XGJJ2