[semi]

There was also a separate release of counterstrike called condition zero that included a single player campaign and a tweaked version of counterstrike multiplayer.

That was not included as part of that bundle.. but if you used the dedicated server tool to download the czero mod and copied it to your halflife folder you could play both the single player and multiplayer version on steam

[gabereiser]

This was how my brother played it. He was too dumb to know the difference because the box art literally looked like CS’s splash screen. CS != CZ but nevertheless, a steam account was a steam account, and technically CZ was HL so he downloaded CS off FilePlanet and was getting destroyed by me and my friends for weeks until he learned the strafe-run hack.