Universal Save System (JSON + Versioning)

Universal Save System is a lightweight, customizable save/load framework for Unity that helps developers add persistent game data quickly without relying on third-party dependencies.

The package is built around a simple ISaveable workflow. Any object can join the save pipeline by implementing save and load methods, which makes the system easy to adapt for many project types. The included runtime supports JSON serialization, multiple save slots, optional PlayerPrefs storage, version upgrading for older save files, and automatic scene-friendly save management through a central SaveManager.

Included example components cover common gameplay needs such as player position and health, inventory data, progression data, and settings data. These scripts are intentionally simple and well-commented so they can be used directly in prototypes or extended for full production projects.

The package also includes:

• A playable demo scene
• A main menu scene with save slot actions
• Save, load, and delete slot flow
• Documentation and quick-start guides
• Assembly definitions for cleaner project organization

This content is highly customizable and suitable for many genres, including survival, RPG, adventure, shooter, sandbox, horror, and simulation projects. It works especially well for developers who want a reusable foundation for local save systems and prefer to expand the data structure to match their own game.

Whether you need a starting point for a prototype or a clean base for a production save system, this package is designed to save setup time and make persistence easier to maintain.