In 1984, Alexey Pajitnov was working as a programmer at the Russian Academy of Science, a research and development center you'd think would be busy designing nuclear warheads during the Cold War. His field was artificial intelligence, however, which meant he could spend a lot of time at his desk creating puzzles and games while pretending to work.
Purely to amuse himself he created the falling-block game Tetris over the course of just a couple of weeks. Everybody in the office got addicted to it and over the next few years deals were made to sell the game abroad.
It has since sold more than 70-million copies, earned a couple of billion dollars in revenue and is available on nearly every single video game-playing device in the world.
And occasionally human skin, apparently.
So How Did the Creator Make Out?
The game was invented in a still-Communist Russia, which usually didn't believe in the whole concept of doing things for personal gain. So for creating the most popular videogame ever, Alexey got a big fat check made out to "Fuck Your Balls" in the amount of "With a Hammer."
Actually, Pajitnov's superiors did make him a deal: They would help him get the game published in the West, and they would keep the money. The Soviet government did graciously say that after 10 years they would revisit the issue and maybe see about sending him some of the cash, but long before that deadline was reached, the Soviet government itself collapsed. Maybe there's some abandoned office in Moscow where Tetris royalty checks continue to land in some bureaucrat's inbox, and squirrels are making a nest out of them.