Xen is the name of the borderworld dimension that Gordon travels to in the first Half-Life, so its not the name of the species of headcrabs/vortigaunts. Headcrabs are headcrabs (aka parasitics, headhumpers), and vortigaunts are vortigaunts.
It was great, could have had some other stuff in it though, maybe more questions or something, but I got them all right, except the release date ones, I don't know when they where released, lol.
You see a vortigrant when you get off the train, hes a slave maid.
Also, the question on how Father laughs is kinda by oppinion.
Some of these questions were extremely easy. Some of them got me confused, because I didnt see Breen shoot me with anything.
Number 6 Chapter 3
Great Game. But as said in the title, the first time you see a vort is when you get to that guy in the giant dumpster in Route Kanal
It was quite easy. I never played the full version of Half life 1 so the green creature stumped me. and to answer Dottorius, it is when you go to Nova Prospekt there is a kitchen with vortigaunts in it but im not sure they actually cook.