Plays inside your own copy of Half-Life 2, on your device, not in a browser tab. Opens github.com in a new tab.
How to play
Have your own copy of Half-Life 2 installed: the mashup plays inside it.
Download it from its release page on GitHub (it runs on Windows).
Install it as its page says. What it asks for is just below, in the list's words.
Start the game the way its page says: some mashups come with a launcher of their own.
What it asks for
Half-Life 2 (D3D9, 32-bit), ReShade 6.x with add-on support, Minecraft 26.3 with Fabric Loader 0.19.5+ and Fabric API, plus the hl2craft jar and HL2Minecraft.addon32 (auto-installed).