カードゲーム9 (Card Game 9) is a Nintendo DS game developed and published by Nintendo in Japan. The game was released in Japan on June 23, 2011. Card Game 9 is a card battle game in which players battle against each other using cards. Players build their own decks with various cards, and then battle against each other to win the game. The game features a variety of cards, including characters from various Nintendo games such as Mario and The Legend of Zelda. Players can also customize their decks with special cards, which can be obtained by completing certain tasks. The game also features a variety of single-player modes, including a story mode and various challenges. Card Game 9 also features an online mode, allowing players to battle against each other over the Internet. Card Game 9 is a great way to experience card battle games, and is a fun game for anyone who enjoys card games.