DS Kageyama Method Dennou Hanpuku - Masu x Masu Hyaku Masu Keisan (デンノウハンプクます×ます百ます計算, Japan) is an educational game developed by Nintendo and released exclusively for the Nintendo DS in Japan. The game is based on the Kageyama Method, which is a popular math teaching method in Japan. It is designed to help children learn basic math skills such as addition, subtraction, multiplication, and division. The game is divided into two parts. In the first part, the player is presented with a series of math problems and must solve them using the Kageyama Method. The player is given a set of numbers and must combine them using the four basic operations to create a specific answer. The game will provide hints and explanations as the player progresses. In the second part, the player is presented with a series of math puzzles. The player must use the Kageyama Method to solve the puzzles. The puzzles range from simple to complex and require the player to use the four basic operations to solve them. Overall, DS Kageyama Method Dennou Hanpuku - Masu x Masu Hyaku Masu Keisan is an excellent educational game that is designed to help children learn basic math skills. It is easy to understand and provides an entertaining way to practice math.