Awesome high quality mod with very detailed levels, custom voice lines and soundtrack.
The Xen levels are similar to Black-Mesa version of Xen with their own original ideas.
It takes about 5 hours to finish it. (1st chapter 1 hour, 2nd chapter 2 hours, 3rd chapter 2 hours)
It has achievements which adds to reply value.
The mod is so well tied to Half-Life that it could very well be an official expansion like blue shift and opposing force.

Awesome high quality mod with very detailed levels, custom voice lines and soundtrack. The Xen levels are similar to Black-Mesa version of Xen with their own original ideas. It takes about 5 hours to finish it. (1st chapter 1 hour, 2nd chapter 2 hours, 3rd chapter 2 hours) It has achievements which adds to reply value. The mod is so well tied to Half-Life that it could very well be an official expansion like blue shift and opposing force.