Black Mesa is an almost exact copy of Half Life at the start, and where that's true it's incredibly well done. Feels very much like a remaster.

Unfortunately, by the end of the earth levels and certainly on Xen, the levels switch over to original designs. They become massive and sprawling, boring and confusing. They really should have stuck to doing a like for like reimplementation.

I grew up on Half Life, so playing the first half of Black Mesa a few years ago was one of my favorite adult gaming experiences. But I gave up who knows how close to finish line after Xen was insufferable.

There is one Xen episode close to the end that is indeed way too big for its own good and quite boring, I will give you that, but otherwise I found the new Xen levels very well made and fleshed out. Lets be honest, the original Xen was quite lackluster...