Grand Theft Auto San Andreas
Here is the Heavens on Earth map modification, this will enable nearly all of the hidden interior levels, although there is one bug however which may cause some the missions to appear incorrectly.
Here is a modification that will add Security Fences around three of the safe houses in GTA San Andreas. These include the garage in San Fierro, the Air Strip in the desert and CJ's house in Los Santos.
Here is the Heineken Beer Brewery Textures for the Fleischberg Brewery and a Shop in Blueberry within GTA San Andreas.
Here is a map modification that will replace the Wang Autos within San Fierro with a detailed and well made Holden Garage.
Here is a modification that will add an airfield above grove street, there is a ramp next to CJ's house. To make this modification work you must start a new game.
Here is a modification that will change the Garage Door within Grove Street to that of a "25 Ta Life" Garage door, which is written on the door itself.