When Soviet software engineer Alexey Pajitnov created Tetris in 1984, he was working on an Electronika 60, a computer with no graphical capabilities whatsoever. To design the iconic falling blocks, Pajitnov had to use text characters. He formed the tetromino shapes using pairs of square brackets like "[]" to represent individual blocks. Despite having only green text on a black screen, the game was so addictive that it quickly spread throughout the Soviet scientific community.
A Puzzle Game Born in a Soviet Computing Centre
In 1984, Alexey Pajitnov was working as a computer programmer at the Dorodnitsyn Computing Centre of the Academy of Sciences of the Soviet Union in Moscow. His primary duties involved testing new hardware and researching artificial intelligence and speech recognition. Because the computing facilities were dedicated to state scientific research, programmers often wrote small puzzle programs and experimental games to test the capabilities of newly installed machines and benchmark their processing limits.
Pajitnov had been fascinated by traditional board games and mathematical puzzles since childhood, particularly pentominoes—a classic puzzle where players fit shapes composed of five equal squares onto a grid or into a box. Recognizing that twelve distinct pentomino shapes were too complicated and unwieldy for a fast-paced, real-time computer game, he reduced the complexity. He scaled the shapes down to four squares each, known mathematically as tetrominoes. There were only seven distinct geometric combinations possible with four connected squares, creating a clean, manageable foundation for a falling-block game.
Engineering Around Zero Graphics
The computer Pajitnov used to create the original game was an Electronika 60, a Soviet microcomputer system based on the DEC PDP-11 architecture. The Electronika 60 possessed no graphical display hardware; it was connected to an alphanumeric terminal that could render only standard text characters. There were no bitmap pixels, no hardware sprites, and no color palettes to draw moving shapes on the screen.
To make the falling shapes visible and distinguishable, Pajitnov relied entirely on text-mode character strings. He represented individual building blocks by printing pairs of square brackets adjacent to one another: "[]". By stacking and positioning these bracket pairs across rows and columns in the terminal's text buffer, he formed the seven classic tetrominoes (the I, J, L, O, S, T, and Z shapes). The game ran in green monochrome text against a dark screen, refreshing the terminal line by line as pieces descended.
The fundamental mechanics of the game also arose from hardware constraints. Initially, Pajitnov designed the pieces to fall and accumulate at the bottom of the screen. However, the Electronika 60 screen quickly filled up within seconds of play, bringing the game to an immediate halt. To make continuous play possible on limited display space, Pajitnov added the rule that completing a horizontal row of blocks would cause the entire row to disappear, dropping the blocks above into the empty space.
The IBM PC Port and Viral Spread
The initial Electronika 60 version was an immediate hit inside the Dorodnitsyn Computing Centre, but the machine was rare outside specialized Soviet research institutes. Pajitnov wanted to bring the game to personal computers, which were becoming more widespread. He enlisted the help of Vadim Gerasimov, a 16-year-old student working as an intern at the computing centre, who had access to an IBM PC.
Gerasimov ported Pajitnov's Pascal code to MS-DOS, implementing graphical blocks using the IBM PC's color text capabilities, adding sound effects, and building a high-score tracking system. This new MS-DOS version could run on standard personal computers, requiring no specialized scientific hardware. Pajitnov and his colleagues copied the game onto 5.25-inch floppy disks and distributed them informally to friends, researchers, and other academic institutions.
Within months, the game circulated across Moscow and reached scientific institutes throughout the Eastern Bloc, including computing facilities in Hungary. Because there was no commercial retail software market in the Soviet Union at the time, the game spread purely by word of mouth and disk-to-disk copying, earning a reputation for being intensely compelling despite having virtually no graphical embellishments.
The Fight for Global Distribution
The international commercial journey of the game began in Budapest, where Robert Stein, an agent for British software company Andromeda, saw the IBM PC port running at the Hungarian Institute of Computer Science. Recognizing its commercial potential, Stein attempted to license the rights from Pajitnov and the Computing Centre via telex, while prematurely selling sub-licenses to Mirrorsoft in the United Kingdom and Spectrum HoloByte in the United States.
Because Pajitnov had developed the software on state-owned equipment while employed at the Academy of Sciences, Soviet law dictated that he held no personal copyright over the work. Instead, the Soviet government handled foreign licensing through Elektronorgtechnica (ELORG), a state-owned foreign trade organization responsible for the import and export of computer software and hardware. When ELORG discovered that Western publishers were selling versions of the game based on unfinalized agreements, a complex legal battle ensued.
The situation resolved in 1989 when Dutch video game publisher Henk Rogers travelled to Moscow to negotiate directly with ELORG. Rogers secured the handheld and home console rights on behalf of Nintendo, paving the way for the game to be bundled with Nintendo's newly released Game Boy handheld console. The pairing transformed the software from an underground computer hit into a worldwide cultural phenomenon.
Pajitnov, Rights, and the Modern Era
Despite millions of copies selling worldwide throughout the late 1980s and early 1990s, Pajitnov received virtually no royalties during this initial boom. The Soviet state retained all revenue generated through ELORG. Pajitnov later stated that he derived satisfaction simply from knowing that millions of people enjoyed his creation, while the popularity of the game eventually helped him emigrate to the United States in 1991.
In 1996, following the dissolution of the Soviet Union and the restructuring of ELORG, the game's rights reverted to Pajitnov. He joined Henk Rogers to found The Tetris Company, which took over managing the intellectual property, licensing, and standardized gameplay guidelines globally. After more than a decade of international fame, the creator finally began earning royalties from the game he had originally typed out in text characters on an Electronika terminal.
Why the Design Endured Without Visuals
The origin of the game illustrates a core principle of game design: compelling spatial logic and immediate mechanical feedback do not require high-fidelity graphics. The core loop—evaluating an incoming shape, choosing its rotation, and managing spatial real estate under time pressure—was fully functional when the pieces were nothing more than paired bracket symbols.
By relying on pure geometric manipulation rather than narrative or visual spectacle, the game bridged cultural, linguistic, and technological boundaries. Whether displayed as green monochrome text on an Electronika 60, four-shade grayscale LCD pixels on a Game Boy, or high-definition modern polygons, the core mathematical rules invented in Moscow in 1984 remain essentially unchanged.
Key takeaways
•Alexey Pajitnov originally built the game on an Electronika 60 computer, using pairs of square brackets ('[]') as text characters because the system had no graphics capabilities.
•The mechanic of clearing completed rows was created out of necessity to prevent the small, text-only display from filling up within seconds.
•Because the game was written on state-owned computers under Soviet law, all initial intellectual property belonged to the state entity ELORG rather than Pajitnov.
•Vadim Gerasimov, a 16-year-old intern, created the IBM PC port that added color, sound, and scoring, enabling the game to spread internationally on floppy disks.