"Tetris" became popular in just two weeks in Moscow and then throughout the USSR, spreading by copying on floppy disks. At that time, all the rights to the game belonged to the computing center, so Pajitnov did not even think about making any profit, because according to the laws of the time, the sale of such things could only be carried out by the state.
In 1986, "Tetris" first went abroad to The Research Institute for Computer Science and Control (MTA SZTAKI), with which the computing center cooperated at the time. There it was ported to the Commodore 64 and Apple 2, and there the game was introduced to Robert Stein, owner of a British software company Andromeda Software, who visited the Institute to look at new products suitable for export to the UK. Stein immediately saw the game's potential and immediately decided to buy the rights. Having arrived back in Britain, he writes a letter to Pajitnov offering to buy the license and, having received a preliminary agreement, promises to send a formal agreement within a few days, not calculating that with the closed regime, things would drag on. Stein begins to lose patience and, not having any official rights, shows the game to a British company, Mirrorsoft, owned by British media proprietor Robert Maxwell. Contrary to Stein's expectations, they don't share his confidence in the game's success and send it to their American subsidiary, Spectrum Holobyte, which instantly sends a reply that the rights to the game must be bought immediately. Mirrorsoft signs a £3,000 contract with Andromeda Software with 7-15% (depending on the number of copies sold) of the sales profits and buys the rights to a PC version of the game (although Stein still had no contract with the game's creator in hand).