# Limbo: restoring Fortnite Save the World OT6.5 missions

> Limbo restores mission play in the 2016 Fortnite Save the World OT6.5 client using an injected game-server DLL and a separate backend. Its development notes describe UE 4.12 name and object table discovery, ProcessEvent tracing, executable analysis and hooks used to rebuild mission behavior. The author reports up to four-player cooperative play, while some missions and enemy behaviors remain incomplete.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/ArielS-gif/Limbo>
- Primary source: <https://github.com/ArielS-gif/Limbo/blob/90f6912c892006b702be4cee14a64e8edb65cb72/docs/DEVLOG.md>
- Catalog page: <https://awesomerea.org/resources/limbo-fortnite-ot65-case/>
- Record JSON: <https://awesomerea.org/resources/limbo-fortnite-ot65-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/limbo-fortnite-ot65-case/index.md)

## Requirements & limits

- **Prerequisites:** The user's own Fortnite OT6.5 build 2252016-3240987; hosting also requires the separate Limbo-Backend.
- **Prerequisites:** Windows and Visual Studio with the C++ desktop workload are required to build the DLL and injector.
- **Limits:** Some missions are untested through completion, Flingers remain inactive and outpost construction is not saved.
- **License:** MIT License for Limbo's own code.

## Primary sources

1. <https://github.com/ArielS-gif/Limbo/blob/90f6912c892006b702be4cee14a64e8edb65cb72/docs/DEVLOG.md>
2. <https://github.com/ArielS-gif/Limbo/blob/90f6912c892006b702be4cee14a64e8edb65cb72/README.md>

## More in Games

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- [Maniac Mansion: a commented C64 engine and loader disassembly](https://awesomerea.org/resources/maniac-mansion-c64-explained-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.