Henk Rogers is the man responsible for first bringing Tetris to traditional gaming platforms. This includes the Game Boy version, which became synonymous with the Game Boy itself. In a recent interview with IGN, Henk talked about the discussion to make that pack-in happen.
"I said, ‘Mr Arakawa (former Nintendo of America president ), you need to include Tetris with every Game Boy’. And he said, ‘Why should I include Tetris when I have Mario?’ And I said, ‘If you want little boys to buy your Game Boy, pack in Mario. But if you want *everyone* to buy your Game Boy, pack in Tetris, because everybody plays Tetris – young, old and male, female. And then you can still sell Mario afterwards and make more money!’"