Mattel claimed rival Zynga's online game "Scramble With Friends" infringed its trademark rights to the word "Scrabble". Zynga disagreed.
Mr Justice Peter Smith ruled yesterday in London, that the key was Zynga's use of an "'m' on its side".
The judge said the word "Scramble" did not infringe Scrabble trademarks.
But said: "Zynga's present logo with the 'm' on its side gives the impression the word is Scrabble when one looks at it quickly and has the propensity to confuse."
It comes as Allan Simmons, from the Borders, is preparing to compete in the National Scrabble Championships tomorrow.