Source Games guides
Choose a game to open its setup guide, requirements and menu settings.
Half-Life 1 →
Half-Life 1, Blue Shift, Opposing Force and Half-Life: Source in one shared guide.
Garry's Mod →
GMod setup, menu settings and troubleshooting.
Left 4 Dead 1 & 2 →
Game selection, requirements and Lua tools.
One Half-Life 1 collection
Supported games: Half-Life 1, Half-Life: Blue Shift, Half-Life: Opposing Force and Half-Life: Source. All four share this product page, feature library and setup guide. Choose your installed edition from Game version for its matching files and settings.
Use this shared guide for all four editions and select the matching title in the loader. Keep the game-specific files and settings for the selected edition.