Part of the 3M Bookshelf Series
Players take turns placing their numbered tiles on the board so that their sum, both rank and file, is equal to a multiple of the "multile" number that is selected for that round. Highest score once all the tiles have been placed wins.
The red "multiles" were introduced in the 1968 edition; the previous (1964) edition didn't have those and played as if the "5" multile were always the one drawn.