Grand Theft Auto Multiverse Mod Runs Three Games Simultaneously

Modders have stitched together three distinct Grand Theft Auto worlds into a single, playable experience, offering PC gamers a glimpse into a chaotic, cross-dimensional sandbox. This project, dubbed the Grand Theft Auto Multiverse Mod, allows players to step through portals that function as real-time windows into other games rather than static video feeds. The technical achievement matters because it bypasses the limitations of the original proprietary engine, proving that legacy titles can coexist in one process without loading screens or performance-killing video capture. For fans of the series, this means exploring a unified map where the boundaries between GTA III, Vice City, and San Andreas dissolve into a single continuous environment.

Modder Dryxio merges three titles using live GPU textures

The mod is the work of developer Dryxio, who engineered a complex system to run all three games simultaneously within a single process. Each portal acts as a live GPU texture, rendering the other game’s world in real-time as you move through it. This approach eliminates the need for video capture to fake the realism, ensuring that transitions between the different eras of the franchise happen instantly via an engine swap. The result is a seamless flow between the distinct visual styles and gameplay mechanics of each title, creating a unified multiversal entity out of previously isolated experiences.

To achieve this, Dryxio modified community-driven reverse-engineering projects known as re3 and reVC, which decompile the original source code for the earlier titles. The mod also uses plugin-sdk to interface with San Andreas, allowing the three separate instances to communicate and render together. The original proprietary RenderWare engine could not handle multiple spatial scenes simultaneously, so the project relies on an open-source reimplementation called librw to manage the rendering. This technical foundation allows the mod to share a single Direct3D device across all three game instances, a feat that was impossible with the stock software.

The modder notes that the system runs all three games inside one process, sharing resources to maintain performance while switching between worlds. There remains uncertainty about the depth of interaction possible within this shared space, such as whether players can drive cars through the portals to enter other games. Additionally, the project exists in a legal gray area, as Rockstar Games could potentially view this integration as copyright infringement and demand its removal. Despite these risks, the mod stands as a testament to the capabilities of the reverse-engineered RenderWare code and the dedication of the modding community.

We looked at similar multi-engine experiments earlier while tracking the evolution of PC gaming modifications. The Grand Theft Auto Multiverse Mod currently remains an internal project rather than a publicly available download. It demonstrates the technical potential of the librw engine and the re3/reVC projects without yet offering a consumer-ready product. The modder has successfully proven that these three distinct worlds can coexist in real-time, setting a new benchmark for what is possible with legacy game engines.