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Tom is still very much a product of the South where as Huck has developed his own moral compass. Huck has developed into a more mature, morally sound individual. Huck always thought Tom's make believe adventures were not worth the time or effort Tom put into them. But, here, he believes they are truly setting Jim free, and releasing him from the bonds of slavery. For Huck, this is one of the most serious and risky actions he has ever undertaken, but for Tom, it is all just a game.