This is the story behind the fiendishly addictive game, a tale of high stakes, intimidation and legal feuds set against the backdrop of Cold War tensions between East and West.

This documentary takes us back to the origins of the game in Russia as systems at the Moscow Computing School were being developed and pushed as to what they could do and one programme starts experimenting with falling shapes based on a famous jigsaw puzzle.

Computer games are made every week in the world and although Tetris was a phenomenon, a documentary that looks at the business dealings and negotiations that took it from a Moscow computer into homes and hands around the world.