Critics point out that after writing the first three chapters, Twain did not continue this novel for some time. When he returned to it, he altered the tone somewhat.
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Twain's first three chapters are mainly about boyish games and have little to do with real life. When he returns to the novel we see far more real life in his work. For example, he deals extensively with unpleasantness, fear, and pain.
The Adventures of Huckleberry Finn