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Depends on what kind of mods you're using, and for what console you are using them with.
Yes! Almost all mods for CS 1.6 work for Condition Zero.
To get the 'Human plug' achievement, you have to stand for a while on the water fountain in the cavern map
go in to mod folder and click on start
if you go to quick match and do watever. you go to the "Modifier" section and select your mod.(you hve to unlock them except for pack mule)
mods are added to the game by:1 downloading them,2 extracting the files (if it's a zip or RAR file),3 putting the extracted folder in the game folder: Frets on Fire/data/mods. you can activate the mods if you start the game and go to options, game settings, mod settings, here you activate it and the mod should be working.
No, counter-strike only uses the same engine.
Well the only viable method I know is Nadi Lai's game mods. This of course costs 10$ to activate. You the get mod points which you can use to spend on game mods.
You should download the mod that you want like christmass mods or else.
You can download AMX Mod X and its plugins at: amxmodx.org
fpsbanana.com will have biggest selection of mods and skins for CSS
you have to download mods from this page: http://wc3mods.net/main/