A chance discovery at a second-hand market in Scotland has handed the gaming community an unexpected gift: an Xbox 360 development kit that once belonged to Rockstar Games, loaded with an early build of Grand Theft Auto 4 from 2007.
Jan, the finder, picked up the device for five pounds at a car boot sale after initially mistaking it for a standard console. The "Phat" Xbox 360 had an unfamiliar expansion device—the Sidecar development module—attached to its side. Only after arriving home did Jan recognize the Rockstar Games sticker and understand the significance of what he'd purchased.
"When doing my rounds, I saw what I immediately recognised as a Phat Xbox 360, with what I first thought looked like a 'tumor' sticking out of it, later turning out to be the Sidecar," Jan told Kotaku. "I wasn't entirely sure what it was, but I knew it was something good."
Since making the discovery public online, the device has become the focus of intense scrutiny from dataminers and technical experts working to extract and analyze its contents. Though the dev kit reportedly contains no other games or files beyond the early GTA 4 build, and despite an eBay listing at $800 being removed due to software licensing issues, the data has already been widely shared. Jan has since shifted to accepting private offers, with at least one bid reaching £1,000.
What the Build Reveals
The 2007 build is partially wiped, but researchers have successfully recovered most files, uncovering significant differences between this prototype and the final release. Beta character models, weapon designs, vehicle schematics, and map layouts have all surfaced, allowing fans to document what evolved during development.
Among the notable discoveries: a ferry system that appears in early trailers but was ultimately cut from the finished game. Developers have managed to get the ferry functional within the beta build, though it crashes when players attempt to spawn additional vehicles on it. Early radio station lineups, cut weapons like a silenced pistol variant, and abandoned gameplay features—including what some believe to be a zombie minigame—have also emerged.
"My jaw is on the floor... This isn't some late build, this is VERY beta," one community member exclaimed. Early cinematic sequences, including previously unseen camera angles, have been extracted and shared online. More recently, some executable sections have been made playable, albeit in broken form.
The sheer scope of differences has energized the community. One fan captured the sentiment widely: "Today has literally been a dream come true to me lol. Can't wait to have some more free time to spend an entire day combing over these files to find some random s**t that was changed."
For GTA enthusiasts, the discovery offers months of material to analyze while waiting for Grand Theft Auto 6, scheduled to launch November 19. Rockstar parent company Take-Two's CEO Strauss Zelnick confirmed that marketing for GTA 6 will begin this summer, with the release date now locked in.
Questions about GTA 6's pricing and distribution model continue to swirl. While some have speculated the game could cost as much as $100, Zelnick has firmly denied rumors that it will launch as a digital-exclusive release, offering at least one concrete detail in an otherwise speculation-heavy announcement cycle.
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