A judge has laid down a letter of the law in a High Court row involving the maker of the Scrabble word game.
Mattel claimed that rival Zynga's online game "Scramble With Friends" infringed its trade mark rights to the word "Scrabble". Zynga disagreed.
Mr Justice Peter Smith, who ruled today after a hearing in London, concluded that the key was Zynga's use of an "m on its side".
The judge said the word "Scramble" did not infringe Scrabble trade marks.
But he added: "Zynga's present logo with the m on its side gives the impression that the word is Scrabble when one looks at it quickly and has the propensity to confuse."