Last month, Crowbar Collective released the first three levels of their long-in-development remake of Half-Life in Black Mesa. And now, after some time, those three levels have now become nine. The first two chapters are now available in the public beta branch, with Xen and Gonarch’s Layer contain nine maps.

The other chapters will be added to the branch later, letting you test all 18 of the expansion’s maps. There are still some known issues that need to be squashed, so check them out here, just so you’re aware.