UnlimitedCans

PSA PLEASE LISTEN: A YouTuber named 'Kelski' has embarked on a valve journey of sorts, as he's never played any of the hl/portal games! For the love of GabeN, go to his channel and watch his videos! I know this is blatant shilling, but we need more spotlights on our beloved series, and I think he's doing a good job. I feel kind of guilty for not talking about this before, but he's put a lot of work into a quality review for all of the hl games up to hl2. Give em a visit, and I'm sure we can get more attention for his channel

Question: What IS CFLU? I only have info from the wiki and it's not very trustworthy + it's not much. So I ask what it is. What are it's symptoms? Where did it come from? How are combine soldiers infected and why wasn't the resistance trying to weaponize it? Is there something I missed or is it simply left ambiguous?