black mesa is the rival of apeture science and it is also a story mod like half-life 1 portal but now they
there will be a demo of this mod soon
this mod will have the textures of half-life 1 and also the sounds of half-life 1
and this will be a story mod .
I included the portalgun
and i also like to say that who ever likes to help with the mod can join the
steam group by clicking here Steamcommunity.com
P.S please i dont want anybody to tell me to change the textures my idea was to change the old aperture science labs I made it to be in the half-life 1 world not portals