Arctic Adventure is a HL2 Episode 2 based modification. In this mod you will ride quick as the wind through the Arctic landscapes and fire the familiar and some new weaponry.
Introducing... Xen
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...Oh snap. But it looks too HL1-y and not very HL2-y, if that makes sense.
Maybe you could redesign the alien terrain and flora yourself to better suit the art style? it just sticks out like a sore thumb.