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That’s because progressive jackpot slots feature a unique mechanic that allows the prize pool to increase with each player’s bet gradually. And because these slots are typically linked , it would be illogical for a player to trigger the pot in play-for-fun mode. So, that’s why most progressive jackpot titles are excluded from free slots to play for fun. Still, you may find some progressive jackpot slots that allow you to try out the game and get the feel of winning a jackpot prize.