Tetris was a puzzle game that was created at the Computer Center of the Russian Academy of Sciences on an Elektronica 90 by Alexey Pajitnov as a prototype. As this computer isn't well suited for games due to a lack of graphical capabilities, he used ASCII characters for the tetrominoes that drop from the top down.
Shortly after the prototype was created, Vadim Gerasimov, then a high school student, converted it to DOS. It was then expanded by Gerasimov, Pajitnov, and Dmitry Pavlovsky, a computer engineer, from 1984 to 1986.
