I'd like to ask you what you mean when using the phrase "catch copy"; is it a kind of promotional text ?Sudoku (< Jp. Sūdoku) is an abbreviation of "sūji-wa dokushin-ni kagiru" or "We like numbers best in celibacy." This is the catch copy used by the puzzle company to explain the rule of placing numbers: A number should be used only once in the vertical and horizontal lines and in the squarre being marked by bold grids. The Japanese word is pronounced with a long and weak U; /sɯɯdoku/. I'd imagine different languages read it differently.