My favorite half life mod by far. It really tells a gripping story. The characters are amazing, the inclusion of Aperture Science from the Portal franchise and the amazing new weapons all lead to the capture of Judith Mossman. To me, it's Half Life 2 Episode 3 that we never got. I also love the defective turret named Wilson. There are so many new mechanics in this game that Valve themselves could not beat. The modified phytoplankton is really cool-looking, and the voice acting in the game is great! They had to reuse from lines from the series of course, but the way they put it was amazing. Truly amazing game that I really enjoyed. I hope Entropy: Zero 3 will happen.