Find the uncopylocked game on Roblox (many are advertised on developer forums or YouTube descriptions). Click the "Edit" button (if the creator enabled it) or download the .rbxl file.

: Searching the Roblox Create Marketplace for "Zombie Attack Kit" or "Uncopylocked Zombie" often yields fan-made versions or older builds shared by community members.

When a developer uncopylocks a game, they are essentially gifting their source code to the community. In the early days of Roblox, high-profile developers frequently uncopylocked their projects to help newcomers learn Lua (Roblox’s programming language) and the logic behind game mechanics.

This game is not the real Zombie Attack 2, you say in your description. Please change the name to avoid clickbaiting your players. Developer Forum | Roblox (Uncopylocked) Zombie Defense 3 - Roblox (Uncopylocked) Zombie Defense 3. Zombie Attack | Roblox вики | Fandom

The controls are intuitive; anyone can jump in and contribute to the team immediately.

Uncopylocked versions are frequently used by developers to learn specific scripting techniques:

I’m releasing my game as uncopylocked – a simple but functional wave-based zombie survival template for Roblox.