The rules of "Super Fun 21" significantly alter standard blackjack strategies, primarily due to its unique features like allowing players to split multiple hands and the ability to double down after splitting, players win automatically with a blackjack, regardless of the dealer's hand, and the game pays out differently for blackjacks and other hands. These elements encourage more aggressive play, as the house edge is typically lower than in traditional blackjack, and players can adopt strategies that focus on maximizing their potential returns.