You can only play progressive jackpot games with real money. The excitement of a big win feels hollow when you know it's fake money. Each spin contributes a small percentage to a shared jackpot pool.
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http://forum3.bandingklub.cz/viewtopic.php...6&t=1229271
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https://debate.socialism.nl/forum/showthread.php?tid=139281
http://horsecity.ru/phpBB3/viewtopic.php?f=13&t=194264