Final answer:
The 'success' of the duke's and king's play in Huckleberry Finn is Mark Twain's satirical critique of the town's gullibility, demonstrating his use of humor and vivid description to reveal the superficial values of society.
Step-by-step explanation:
In Mark Twain's Huckleberry Finn, the "success" of the duke's and king's second advertised play serves as a final jab at the town by showcasing Twain's deft ability to use humor and sarcasm to critique society. The duke and king's fraudulent endeavors are rewarded by the gullible townspeople, representing Twain's satirical take on both the ease of deceiving the public and the superficiality of society's values. Twain's clever use of vivid description and theme to shape these events highlights his critical viewpoint on the politics and social dynamics of the day, encapsulated within the microcosm of the town that falls for the duke's and king's charades.