Preservation groups Hidden Palace and DevStash have released the first playable build and source code of Treasure Tails, a cancelled April 1993 game for the Sega Mega Drive developed by Sega Technical Institute.
This historical material was retrieved directly from the original floppy disks of Ken Rose, who served as a senior programmer at the legendary American studio during the early 1990s. Following an interview conducted in December 2025, the veteran developer sifted through his personal archive and shared unreleased prototypes spanning six projects from the studio founded by Mark Cerny.
Origins of the project and animated tie-in
In late 1992, Sega of America management requested a short and simple Tails-focused title from Sega Technical Institute aimed at the Christmas 1993 shopping season. The concept took shape as Treasure Tails, an isometric puzzle-adventure set across a maze-like world.
The small team featured Ken Rose and Earl Stratton handling programming, Hoyt Ng on design duties, and Craig Stitt serving as the sole artist. Design documents accompanying the release indicate that the game was planned as a direct tie-in to the animated series Adventures of Sonic the Hedgehog, specifically connecting with the episode Tails' Tale.
In that animated story, Tails embarks on a solo journey through an ancient temple to challenge a villain named Comomatz. Sega's corporate vision at the time favored cross-media synergy, matching similar strategies seen with Sonic the Hedgehog Spinball and other animated tie-in projects of that period.
Crushing calculations and swift cancellation
As development progressed, the artistic demands of an isometric game clashed with the strict release window required for a holiday debut. Realizing the massive workload resting on a single pair of hands, Craig Stitt raised concerns about the production schedule.
In response, Ken Rose instructed Stitt to tally every individual animation required to bring the finished game to life. The final estimate was devastating: finishing all the art assets would take roughly four years of non-stop work for one artist, an impossible reality under Sega's holiday timeline.
Armed with these findings, the developers approached studio head Roger Hector. On April 16, 1993, Treasure Tails was officially cancelled, and its core staff was reassigned to complete Sonic the Hedgehog Spinball, where Rose ended up programming the bonus stages.
The salvaged build dates to April 1993. While original design documentation and Stitt's personal recollections noted temple backgrounds made with Digitizer mockups, this playable build never integrated those final environments before the plug was pulled.