Red Faction: Guerrilla
To disable the hud in Red Faction: Guerrilla, download the Toggle HUD mod from here:
You need to run the game in DX9 mode for this to work.
Right click the game in Steam, select properties and then "set launch options", type this:
If you don't have Steam version just do the same but with a shortcut. Then just place all files where the game .exe is located
Glitches: This also disables menus, when you start the game press 0 to see the menu.
Use the 0 key to enable/disable HUD ingame
If you want to bind it to a closer key like TAB, open DX9Settings.ini and change
Key = 48
Key = 9
TAB is already used to open the map, so you need to rebind that.