Did anybody else here not know that you could download extra mission packs for the offline Condition Zero? Well, you can.
link
This site gives a good overview of some Mission Packs available for download. I'll give more basic instructions here, and then if you play any of the mission packs, please reply to this thread with your experiences!
Download link
Mirror
Installation instructions
1. Download whatever mission pack you like.
2. Unzip the content. The zip files are in a good folder structure, exactly where you need to put them. Most of them will unzip directly to your czero folder:
Code:
C:\Program Files\Steam\steamapps\your_account_name\Condition Zero\czero
3. Some of them contain things like maps or wad files. Those will go into the appropriate folders (again, it's really well organized within the zip folders).
4. Open your game and choose Play Counter Strike:Condition Zero.
5. Choose your mission packs from the drop down menu at the top right of the page.
6. Play!