peashooter85:

In 1989 Nintendo President Hirochi Yamauchi had his chief game designer Shigeru Miyamoto evaluate the game Tetris. A few days later he asked Miaymoto if it was a good game. Miayamoto responded “yes, it is a great game.” When Yamauchi ask why, Miayamoto responded, “because all of your secretaries and accountants are playing it.”

Source: The Gaming Historian

Please watch his new hour long video on the history of Tetris, which is awesome.