Persons representing the extremes of intelligence cannot be included in the same study unless they are approximately equated on mental age, in which case the relative performances of the extreme groups can provide useful information about the nature of intelligence. (Author/RD)

Mentally retarded individuals have more difficulty dealing with strategic games and puzzles than other tasks. Games have been played since ancient times and throughout the world, with performance indicating wisdom. Games invariably express certain universal intellectual traits. Mancala and Three in a Row games are briefly described. (Author/RD)