To play through
Half-Life's single-player storyline co-operatively,
full HLSP co-op support needs to be installed on the
server (for example, if you were playing on a LAN, it
would need to be installed on the computer the game
was started on, but would not need to be installed on
the client machines joining the game).
To install full HLSP co-op
support after the installation of SC v3.0, download
this installer, then follow the instruuctions.
Once full HLSP support is
installed, you can play them by starting a game using
the map "hl_sp_portal.bsp".
Clients simply join as normal. The hl_sp_portal map
allows you to choose from many different starting
points in the course of the Valve SP maps... more
choices are available in the second time zone (jump
through the glowing portal).
If you wish to "save" your
progress at a certain point, you can type "status" to
check the name of the map you're currently on (e.g.
c1a2e.bsp). To resume play from that map, begin a game
then change to the appropriate map using the
changelevel command in the console (e.g.