Nintendo 64 game Controller Kensa-ki NUS-yo N Cassette (Japan) (Test Program) (日本語名：テストプログラム・ケンサキNUS-YO N カセット) is a Japanese-exclusive game controller released by Nintendo in 1998. It was designed to be used with the Nintendo 64 console and was released exclusively in Japan. The controller was designed to be used for testing and debugging of Nintendo 64 games during development. It was not designed for use by consumers. The controller is shaped like a regular Nintendo 64 controller, but it has several additional buttons and features. It has two analog sticks, two C-buttons, a D-Pad, and four shoulder buttons. It also has two additional buttons located on the left side of the controller. The Kensa-ki NUS-yo N Cassette also has a built-in memory card slot, which allows the user to save game data. The controller is powered by two AA batteries. The controller was released exclusively in Japan and was never released in other countries. It was designed to be used by developers and is not available to consumers. It is considered to be a rare and collectible item by Nintendo fans and collectors. Overall, the Nintendo 64 game Controller Kensa-ki NUS-yo N Cassette (Japan) (Test Program) is a rare and collectible item that was designed to be used by developers for testing and debugging Nintendo 64 games. It was released exclusively in Japan and is not available to consumers. It is considered to be a rare and collectible item by Nintendo fans and collectors.