Kuusou Kagaku Corporation is a software company founded in 1991. It began as a software development studio in the Kanto region and moved to Amami Oshima, Kagoshima, in 2011. The company plans, develops, and distributes its own software, drawing on experience across several generations of computing.

Its smartphone games include Metro Keeper, a slide puzzle inspired by Tokyo’s subway lines; Four-Player Mahjong, with beginner assistance, customizable rules, and play options; and Solitaire R, which automatically generates solvable Klondike games and includes a guide for getting unstuck. The company reports more than 300,000 downloads for its smartphone Mahjong game and a history of developing games and mobile applications.

Kuusou Kagaku also works alongside group companies specializing in software technology and services. Kuusou Kagaku Technology develops and licenses *C++ (Asta C Plus), a C++-based language with automatic memory management. Kuusou Kagaku Studio handles game production, while Kuusou Kagaku Solution supports development environment setup and provides server services. The group serves clients in technology, telecommunications, and entertainment.