The 2014 era of Grand Theft Auto modding was a golden age for "Zombie Apocalypse" conversions, specifically for and GTA San Andreas . While there isn't a single official game titled "GTA Zombie Apocalypse," the community created high-quality total conversion mods that transformed the urban sandbox into a survival horror nightmare.
Many zombie mods require a "Map Editor" to place the apocalyptic debris around the city. If you'd like to get started, I can help you find: The exact download links for the most stable 2014-era mods.
Modified the map with debris, crashed planes, and overgrown flora.
The (like DayZ or Project Zomboid ) if you want a smoother experience.
Which (San Andreas, IV, or V) are you planning to mod?