Tetris

Tetris is a puzzle video game created in 1985 by Alexey Pajitnov, a Soviet software engineer. In the game, falling tetromino shapes must be neatly sorted into a pile. Once a horizontal line of the board is filled in, the line disappears, granting points and preventing the pile from overflowing. Since its initial creation, this gameplay has been used in over 220 versions, released for over 70 platforms. Newer versions frequently implement additional game mechanics, some of which have become standard over time. As of December 2024, these versions collectively serve as the second-best-selling video game series with over 520 million sales, mostly on mobile devices.