The Konami Exodus (October 1992)
In October 1992, a group of developers working inside Konami made a decision. They left. The team - led by Masato Maegawa, who had contributed to the Contra and Probotector series - did not leave for higher salaries or better conditions. They left because Konami's structure did not allow them to make the games they wanted to make. They wanted action games built to their own specification, under their own authority.
Treasure Co., Ltd. was incorporated that October in Kōtō, Tokyo. The founding staff was small - approximately thirty people - but they were experienced, motivated, and already working on their first title before they had finished incorporating. The speed with which Gunstar Heroes appeared the following year reflects the urgency of that founding impulse.
The name was deliberate. Treasure. Not a corporation, not a studio, not a development company - a cache of something valuable, waiting to be found. The name articulated an aspiration that the games would spend the next twelve years fulfilling.
Gunstar Heroes and the Sega Partnership (1993–1995)
Gunstar Heroes launched on the Mega Drive in September 1993, published by Sega. The relationship with Sega was not accidental - former Konami staff had existing connections with the platform holder, and Sega in 1993 was hungry for first-party-quality software from independent studios. Gunstar Heroes was exactly that: a Mega Drive game that felt like a first-party showpiece.
The game was directed by Maegawa and featured music by Norio Hanzawa. Its combinable weapon system - four basic shots that merged into ten combinations - gave the two-player co-op an improvisational quality that complemented the designed chaos of the levels. The boss encounters were the centrepiece: large, mechanically inventive, and built around set-piece transitions that made each one feel like a self-contained spectacle.
Treasure signed an agreement with Sega for exclusive development on Sega platforms following Gunstar Heroes' success. What followed was a rapid sequence of Mega Drive titles: McDonald's Treasure Land Adventure (1993, a licensed platformer), Dynamite Heady (1994, a puzzle platformer built around a detachable head mechanic), and Alien Soldier (1995, a boss-rush shooter released in Japan and Europe only). Each game was formally inventive; none repeated the template of its predecessor.
Saturn Era (1996–1998)
As the Mega Drive era closed, Treasure moved to the Sega Saturn. Guardian Heroes (January 1996) was the first Saturn title - a beat-'em-up with RPG elements, a branching story, and a versus mode supporting up to six players. It demonstrated that Treasure could think structurally as well as mechanically: the branching paths and character roster gave the game a replayability that single-path beat-'em-ups could not match.
Silhouette Mirage (1997) introduced a polarity system that anticipated Ikaruga: enemies had a Silhouette attribute and a Mirage attribute, and only the matching weapon type dealt full damage. The game was published by ESP in Japan and localised for PlayStation in North America by Working Designs.
Radiant Silvergun (1998) was the Saturn's valediction - a vertical shooter of staggering ambition, published in Japan only, that became one of the most sought-after import titles of the era. Designed and programmed by Hiroshi Iuchi, it replaced the traditional power-up model with seven permanent weapon types selectable via button combinations. Experience accumulated across playthroughs, so repeated attempts rewarded the player even when the run ended early. The game was never released outside Japan during the Saturn era; it reached Western players via the 2011 Xbox Live Arcade port.
N64 Partnership (1997–2000)
The exclusive Sega arrangement did not preclude work on other platforms indefinitely. From 1997, Treasure began developing for the Nintendo 64, primarily through a publishing relationship with Nintendo.
Mischief Makers (1997) - a 2D platformer with a shake mechanic as its core input - was an early N64 title that demonstrated Treasure's willingness to build games around a single novel interaction. Bangai-O (N64, 1999; Dreamcast, 2000) was a mech shooter with a bullet reflection system and enormous on-screen chaos - published by ESP in Japan and Infogrames in the West.
Sin & Punishment (November 2000) was the culmination of the N64 era and one of the most culturally significant Japan-only releases of any platform. Published by Nintendo for Japan exclusively, it was an on-rails shooter of kinetic intensity, set against a science-fiction version of Tokyo in 2007. It received no Western N64 retail release; an English fan translation patch became the primary route for Western players until the Virtual Console release in 2007–2008. The game was eventually followed by a Wii sequel in 2009.
GameCube Era and Ikaruga (2001–2004)
The GameCube period produced Treasure's most formally accomplished work. Iuchi's Ikaruga - originally an arcade release in December 2001 on the Naomi board - arrived on GameCube in January 2003 in Japan, reaching North America (via Atari) in September 2003. The polarity-switching mechanic was the most precisely conceived system in Treasure's catalogue: absorb bullets matching your polarity, deal double damage to enemies of your opposite polarity, chain kills in groups of three to multiply score. A game of absolute rules that opened onto infinite variation.
Alongside Ikaruga, Treasure developed Wario World (2003) for Nintendo - a 3D platformer marking a significant departure from their usual genres - and Astro Boy: Omega Factor (2003/2004) in co-development with Hitmaker for Sega. The final original release of Treasure's creative peak was Gradius V (2004), developed for Konami on PlayStation 2: a return to the Konami stable, and the most technically accomplished entry in the Gradius series.
Dormancy (2004–Present)
After Gradius V in 2004, Treasure's output slowed dramatically. Bangai-O Spirits (DS, 2008) extended the Bangai-O formula for handheld. Sin & Punishment: Star Successor (Wii, 2009 in Japan; 2010 in the West) was a sequel that received critical praise but did not restore the studio's former release cadence.
Treasure released no new original titles after Star Successor. As of 2026, the studio remains incorporated and retains ownership of its intellectual property. No active development has been announced. The dormancy is not dissolution - Treasure still exists - but it represents an extended creative silence from one of the most productive action studios in Japanese game history.
The games themselves have found new audiences. Ikaruga reached Steam in 2014 and Nintendo Switch in 2018. Gunstar Heroes appears on Nintendo Switch Online and Steam via the Sega Genesis Classics compilation. The work endures.