More Fun Comics #21

More Fun Comics #21 is an anthology issue featuring multiple stories and features. The visible contents include a "Fun Club" section with a limerick contest for club members, offering a $2.00 grand prize for the best submitted line to complete a five-line poem. The issue also contains an adventure story involving cowboys and miners who discover a hidden trap-door and become trapped in a dark cave, forcing them to work together to find another way out while avoiding violence, with the narrative continuing across multiple pages of action sequences.