Elle peut être sous forme de free spins ou bien d'un bonus pourcentage.
https://foro.murenacidos.com/showthread.php?tid=25970
http://47.88.101.141/forum.php?mod=viewthread&tid=262193&extra=
http://www.lada-xray.net/showthread.php?p=239916#post239916
http://tv-online.simple-otr-mirror-alternative.de/phpBB3/viewtopic.php?f=45&t=15936
http://oldsite.giessen46ers.de/fantalk/viewtopic.php?f=1&t=218083
https://forum.zweb-apps.xyz/viewtopic.php?t=200615
http://www.lada-xray.net/showthread.php?p=330942#post330942
https://67farms.st/viewtopic.php?t=22286
https://foro.muvenezuela.org/showthread.php?tid=59456
http://miweii.com/forum.php?mod=viewthread&tid=19544&extra=
http://www.lada-xray.net/showthread.php?p=257365#post257365
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=613624