This document only lists Chaos Source-specific launch options, for a full list of launch options, please see the Valve Developer Wiki page.
|-mountmod||Specifies the mod to launch the game with. Must be an absolute path|
|-nogamemount||Do not mount any games/mods specified in the gameinfo mounts block or mounts.kv|
|-nocustommount||Do not mount any folders specified in gameinfo which contain wildcards (* or ?), usually “custom” folders|
|-legacyui||Launches the game with the old VGUI GameUI|
|-dx11||Launch game with DirectX 11 shaderapi (On Linux, this will launch dx11 with dxvk)|
|-multirun/-allowmultiple||Disables the creation of the source engine mutex, and allows the game to start even if one already exists|
POSIX-specific options (Not available on Windows)
The following options are only available on Linux currently.
|-nomousegrab||Forbids the game from grabbing the mouse|
|-exclusivefs||Run game with non-desktop friendly fullscreen. This will resize your display resolution (Deprecated)|
|-noexclusivefs||Run game with desktop friendly fullscreen, which is the default regardless (Deprecated)|
|-d9vk||Launches the game with dx9 through dxvk|
|-winecompat||Runs hammer with some workarounds for wine bugs/differences|