Tetris is perhaps the most popular video game ever made. How did a Soviet programmer create a product which has now earned nearly $1 billion in sales? Alexey Pajitnov had a love for pentominoes and became obsessed with turning it into a computer game. In the fast-paced business story "The Tetris Effect: The Game That Hypnotized the World," reporter Dan Ackerman reveals how Tetris became one of the world’s first viral hits.