If a game offers an RTP involving 99%, then this paid back $99 of every $100 wagered last 30 days.
https://talkingpoints.org/subx/showthread.php?tid=86282
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http://horsecity.ru/phpBB3/viewtopic.php?f=18&t=449317
https://www.ukalachat.net/forum/index.php?topic=20091.new#new
http://www.lada-xray.net/showthread.php?p=273356#post273356
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