SOHL12Launcher is a separate app which uses Xash3D FWGS engine and can use to run techdemos, games and mods which uses Half-Life game data and Spirit of Half-Life v1.2(or older) toolkit features. To play it, make sure you followed these steps: 1) Installed Xash3D FWGS and this app from play market. 2) Copied "valve" folder from your Steam account to your Android device. (e.g. to "xash" folder on your device storage. If you choosed another folder, make sure you are choosed this in Xash3D FWGS app) 3) Copied any mod folder with game data downloaded from list at link below on your device. https://github.com/FWGS/xash3d/wiki/List-of-mods-which-work-on-Android-and-other-non-Windows-platforms-without-troubles#list-of-mods-which-based-on-spirit-of-half-life 4) Added -game key in cmd args. This app based on Spirit of Half-Life 1.2 by Laurie Cheers Flying With Gauss is not affilated with Valve Software or any of their partners. All copyrights are belongs to their respective owners.