RNG-powered games usually have demo modes you can test without using real money. Players can also share their complaints and can share their thoughts with the customer service staff.
http://strada.bielsko.pl/1_lubelskie/forum...e-polska#664183
http://forum.spolokmedikovke.sk/viewtopic....3&t=1193900
http://bbs.xixiku.cloudns.ph/bbs/forum.php...8787&extra=
http://horsecity.ru/phpBB3/viewtopic.php?f=9&t=153402
http://horsecity.ru/phpBB3/viewtopic.php?f=35&t=141254
https://phantom.everburninglight.org/archbb...=624265#p624265
http://strada.bielsko.pl/1_lubelskie/forum...egerszeg#664057
http://horsecity.ru/phpBB3/viewtopic.php?f=8&t=168863
http://forum.animogen.com/viewtopic.php?f=9&t=1584149
http://horsecity.ru/phpBB3/viewtopic.php?f=2&t=430708
http://users.atw.hu/tunedthings/viewtopic....p=408648#408648
http://horsecity.ru/phpBB3/viewtopic.php?f=34&t=159327
http://www.prepody.ru/topic85528.html
https://achow.jumgoo.com/forum.php?mod=view...9933&extra=
http://www.prepody.ru/topic50839.html
http://forum.bandingklub.cz/viewtopic.php?f=48&t=1644007
https://talkingpoints.org/subx/showthread.php?tid=32204
http://forum.bandingklub.cz/viewtopic.php?f=49&t=1263574
https://45.83.123.20/viewtopic.php?t=17610
http://forum.bandingklub.cz/viewtopic.php?f=17&t=1709470
http://forums.shlock.co.uk/viewtopic.php?f=2&t=428407