is a puzzle video game developed and published by Nintendo. It was released for the Nintendo DS on March 20, 2006, in North America, April 13, 2006, in Australia, April 21, 2006, in Europe, and April 27, 2006, in Japan. An installment of the Tetris franchise, the game supports up to ten players locally, and supported online multiplayer of up to four players using Nintendo Wi-Fi Connection prior to its discontinuation. Tetris DS features several new modes of play, each with a different theme styled after retro Nintendo games. They include Super Mario Bros., The Legend of Zelda, Metroid, Donkey Kong, and Yoshi's Cookie. Multiplayer gameplay also incorporates items to be used competitively. The game received positive reviews from critics, who cited its additional game modes and multiplayer capabilities. Long after its release, it continued to be upheld as the best portable Tetris title, and one of the best in the series. Gameplay The game is split into six unique single-player modes, some of which are usable in the game's multiplayer. Each game variant is represented by a different Nintendo theme and character from a retro game, with the Super Mario Bros. sub-series featured in the game's standard, default mode, while other series appear in the alternate modes that provide a different spin on gameplay. The game's standard mode plays in a similar manner as classic Tetris, in which the player must move clusters of different-shaped tiles (tetrominos), manipulate them as they drop by spinning them, and place them in a pile at the bottom. Players must stack each piece without empty space so that they can continue clearing lines of the pile. Difficulty of this mode increases with every 10 lines cleared. The game makes use of the infinite spin feature that was initially introduced in Tetris Worlds, allowing the player to prevent a piece from being locked as long as it continues to spin. The Zelda-themed Mission mode features changing goals that appear in the top-right of the top screen; sometimes, only certain pieces can fall depending on what goal is active. A "hold" box allows the player to save a piece for later use. Push mode is a competitive two-player game, where the objective is to push the opponent's pieces towards the bottom of the screen. The player always controls the top screen and must clear two or more lines to shift the block down towards their