: You must have a legally purchased copy of Half-Life on Steam. You copy the "valve" folder from your PC to your device and use the Xash3D app to launch it.

: A lightweight utility specifically designed for quickly loading individual maps in singleplayer or deathmatch mode without using the in-game console. Where to find : Hosted on the TWHL community site . Essential Requirements

To use any of these launchers effectively, you generally need the original game files.