Tetris at 42: the story of the puzzle you can't put down

There's a line of pieces falling far too slowly while you try to decide where to fit them. Two blocks that need to go left, but the hole waiting for them is on the wrong side. The nearly complete line sits there, mocking you, until the right piece appears and the whole thing vanishes at once — and a moment later you're already looking at the next piece and you've forgotten clocks exist.

That happened for the first time on 6 June 1984. On a Soviet computer with no graphical interface. And 42 years later it's still happening on every device with a screen.

A programmer, a paper puzzle and a 1970s computer

Alexey Pajitnov worked at the Dorodnitsyn Computing Centre, part of the Soviet Academy of Sciences, in Moscow. The official job was research into speech recognition and artificial intelligence. But in his spare time, Pajitnov made games — more than twenty different kinds — to run on the only equipment available: the Elektronika 60, an unauthorised Soviet clone of the American PDP-11 computer, built in the 1970s.

The inspiration came from a physical pentomino puzzle — pieces made of five square blocks that you fitted onto a board. Pajitnov liked arranging those pieces and wanted to create a computerised version. The maths of pentominoes was too complex for the hardware, so he cut it down to four blocks per piece. Tetra, in Greek. Plus the "nis" from tennis, the programmer's favourite sport. Tetris.

The Elektronika 60 had no graphical interface — text only. Pajitnov modelled the field and the pieces using brackets and spaces, standard terminal characters. The complete game took up 2.7 kilobytes of memory. A photo taken on a phone today is more than ten thousand times that size.

The first working version was ready on 6 June 1984. The immediate problem: nobody could stop playing it. Tapes with copies of the game began circulating between Soviet research institutes at a speed that was suspicious for software that technically didn't even exist on the market.

The Iron Curtain and the fight over the rights

Over the following five years, Tetris would spread across the world in ways that rival any espionage thriller. The Soviet Union claimed the rights to any product created by a state employee — Pajitnov received no royalties. The game reached the West through irregular copies, piracy and confused deals with companies that didn't always hold the rights they claimed to hold.

In 1988, Henk Rogers, a Dutch businessman based in Japan, saw Tetris at a trade show in Las Vegas. He was immediately obsessed. He got a meeting in Moscow, negotiated directly with Soviet government agents and secured the worldwide handheld rights — which in practice meant the Game Boy, which Nintendo was about to launch.

Rogers went further and convinced Minoru Arakawa, president of Nintendo of America, to include Tetris as the Game Boy's launch game in the West instead of Super Mario Land. The argument was blunt: Mario sells to children. Tetris sells to everybody.

Arakawa bought it. And he was right.

35 million copies on a screen with four shades of grey

The Game Boy version of Tetris sold 35 million copies — more than any other game on the console. Parents who had never touched a controller bought a Game Boy because of Tetris. Dentists put the console in the waiting room. Travellers played it in aeroplane seats. The puzzle that was born without a graphical interface found the perfect hardware in a monochrome screen with four shades of grey — and the two became inseparable in the memory of a generation.

If you want to understand why the Game Boy was a brilliant proposition even while being "technically inferior" to everything it competed against, the post about Nintendo's grey brick explains it well — including the role Tetris itself played in Nintendo's strategy.

Why it's impossible to stop

Tetris has no story. No characters. No visible skill progression. And it's still impossible to put down.

The answer lies in a mechanism researchers call the Zeigarnik effect: the brain's tendency to keep any unfinished task alive in working memory. Every nearly complete line in Tetris is an open task in your brain. When it closes, relief follows. And right behind it comes the next piece — with another nearly complete line.

Pajitnov didn't know that in 1984. He created the loop by intuition, tuning the paper puzzle he played alone in the office. The result is one of the most efficient game designs in history: simple to understand, hard to master, built never to have a natural ending.

42 years later

In total, the Tetris franchise has sold more than 520 million copies across all platforms. There's a version of the game running on calculators, on modified oscilloscopes and on the LED panels on building façades. Tetris Effect (2018) was praised for its audiovisual experience in virtual reality. Tetris 99 (2019) turned the puzzle into a battle royale with 99 simultaneous players — and it works better than any description can convey.

In 2024, Pajitnov took part in the game's 40th anniversary celebrations and said he still plays Tetris regularly. At 69, the man who created the most famous puzzle in history uses exactly the software he invented to unwind after a long day.

Forty-two years of falling. And it still hasn't hit the floor.

Which platform was your Tetris? The Game Boy from the rental shop, the calculator version at the back of the classroom or Effect with a headset? Tell us in the comments. And if you like that crossover between the Cold War and the computing that changed the world, don't miss the post about Deep Blue in 1997: when a machine beat the world's greatest chess player.