IMPORTANT
Since releasing this episode a month ago, it's become apparent that on some peoples' machines, it doesn't work properly. I was going to take it down, but thinking about it, I'll leave it up, so that if anyone wants to try it, they can. But be aware, it might not work properly. I'll post a fixed version in the next couple of weeks. Major apologies to anyone who wasted time trying to get it to work but couldn't. I should have tested it on other peoples' machines first.
I've been working on this for ages, and I'm pretty pleased with how it turned out. The architecture isn't spectacular but it's reasonable. I think the gameplay is the best thing about the episode, and the scripting is okay, too. There's also a storyline that runs through it all, like in Half-Life.
It actually takes place during some of the events in the original game; namely during the last stages of 'On a Rail', when Freeman launches a satellite delivery rocket. In Operation Nova, the military have brought in a SAM launcher to shoot the satellite delivery rocket down mid-flight, and it's your job to stop that happening.
Some screenshots can be seen at these URLs:
http://www.geocities.com/ben_2891_uk/screenshots1.html
http://www.geocities.com/ben_2891_uk/screenshots2.html
