Sachen is a Taiwanese publisher historically known for producing unlicensed games for Nintendo platforms during the late 1980s and early 1990s, with titles like Zoo Block and Worm Visitor among their releases. Their catalogue of around 53 games represents a curious and often overlooked chapter in gaming history, associated with grey-market cartridges across multiple regions. Collectors and retro gaming enthusiasts continue to seek out Sachen titles for their oddity and historical curiosity.