The safest and easiest way to mod your game is through the official Steam Workshop:

: A versatile "All Client" mod menu designed specifically for Zombies, offering extensive customization for the UI and gameplay entities. Essential Security & Performance Mods

Before installing a menu, it is strongly recommended to use these safety tools:

: An open-source menu favored by the community for its wide range of features and consistent updates.

: A popular choice for unlocking camos, liquid divinium, and reaching Master Prestige. It typically requires an external injector like Process Hacker.

: A mandatory background program for anyone playing on Steam to protect against network attacks and IP spoofing.