Sudoku Creator’s Brilliant Mistake
An article in the New York Times describes the success of Sudoku that was drven by the creator forgetting registering the trademark in the US:
While no one knows how much revenue is generated by the global sudoku business, most agree it has easily topped $250 million over the last two years from an estimated 80 million devotees. The New York Times syndicate provides a variety of logic puzzles, including sudoku, kakuro and others, for newspapers and Web sites around the world.
Nikoli received only a sliver of that money. Mr. Kaji says his private company, with just 20 employees, had annual sales of about $4 million.