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Sounds. Hello and welcome to the Witness History Podcast from the BBC World Service.

It's 40 years since a Russian scientist invented the classic early computer game Tetris.

In 2011, Chloe Hedgemuthio spoke to its creator and a businessman who helped make it a global splash.

It all started in the early 1980s.

A young researcher at Moscow's Academy of Science, Alexi Pichitnov, isn't being chatted. A in other ways. My work was very technical and actually I got a little bit bored that time.

And for all my life I like all kind of mathematical puzzles, readles, as soon as I have some

computer in my possession I start to entertain myself write my own puzzles and games as well and that was just one of them.

My inspiration was the board puzzle game called Pentomino.

It's a small box with the 12 different shape made out of 5 squares.

You take it from the box and those are very interesting very different shape and you try to play with them like you play with jigs or puzzle pieces.

But the real challenge is to put them back in the box and you could spend a good couple hours trying

doing it. And when I start programming this virtual board game, the Tet is idea kind of sparkled. How did it take off? Well at that time

we have not enough space and not enough computers so we share lots of people one room

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