Tetris (テトリス) is a classic Nintendo 3DS game released in Japan in 2011. It is a puzzle video game developed by Nintendo and based on the popular Russian game of the same name. The objective of the game is to rotate and move falling blocks called tetrominoes to create a horizontal line without any gaps. Players must clear lines as quickly as possible to score points and advance to the next level. The game features multiple modes, including Marathon, 40 Lines, Ultra, and Master. Each mode has its own set of rules and objectives. The game also features online play, allowing players to compete against each other around the world. Tetris is a timeless classic that is sure to provide hours of fun for all ages.