Players in turn roll the 21 word cubes, set the timer and form sentences with the words appearing on the tops of the cubes in a crossword puzzle-like fashion (one word may be part of two sentences - one running vertically and one running horizontally). Turns end when the egg timer runs out. Players score 50 points for each sentence of 7 words or more. All other sentences score the square of the number of words in the sentence (i.e. a 4-word sentence scores 4 X 4, or 16 points). A bonus of 50 points is awarded if all 21 cubes are used. Two points are deducted for each unused cube.
The 1983 version of the game seems to differ in the number of cubes. The rules on the inside of the box lid still have a 1971 copyright date, but among other differences, they state that the game contains 27 cubes. Two of the new cubes are marked with stars on all six sides, making them wild. From the 1983 rules: "When playing a wild cube, a player must state what word it represents, after which it cannot be changed during that turn."
The 1988 version has 24 cubes - two of which are the starred wild dice. The box states that this is the 2nd edition of the game from Coleco Games. Selchow & Righter is credited in the directions as a subsidiary of Coleco Industries, Inc. The majority of the outer box is blue.