They have more pay lines than classic slots, which means that you have a better chance of winning.
http://www.lada-xray.net/showthread.php?p=241251#post241251
https://sgs-game.com/forum/thread-197342.html
https://67farms.st/viewtopic.php?t=10415
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=385201
http://vortex.mx.free.fr/forum/viewtopic.php?f=38&t=15618&sid=a33ca6d9580b87f709865aa9d7c47b69
https://67farms.st/viewtopic.php?t=25244
https://ufr-2020.front5.picapo.net/forums/viewtopic.php?pid=576856
http://biopharmamash.com/viewtopic.php?t=1795713
https://talkingpoints.org/subx/showthread.php?tid=74584
https://muchroom.ng/index.php?topic=94620.msg110386#msg110386
http://myweed.rocks/viewtopic.php?t=48579