COSO emerged in the gaming scene with Mahjong Expedition in 2020. This title received positive feedback for its engaging gameplay and innovative approach to the classic game of Mahjong, attracting both casual and seasoned players. The company's dedication to enhancing traditional gaming experiences is evident in titles such as Mahjong Adventure and Mahjong Quest.

Specializing in puzzle and strategy genres, COSO has developed games for platforms including mobile devices and PC. Their work on Mahjong Expedition showcased unique features such as customizable game modes and interactive tutorials, influencing the casual gaming landscape.

The publisher has achieved significant milestones such as expanding their game library and establishing partnerships with various app stores to enhance market reach. Their commitment to quality has allowed them to tap into a growing audience of puzzle enthusiasts.

COSO's portfolio reflects a commitment to delivering quality gaming experiences. Their contributions have resonated with players and critics alike, earning recognition for high ratings and positive reviews in gaming publications.

COSO continues to shape the puzzle genre with upcoming projects like Mahjong Legends, demonstrating their ongoing influence in the industry.