200703231250An article in the New York Times describes the success of SoDuku that was drven by the creator forgetting registering the trademark in the US

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.

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