The first of these is the Stacked Wilds feature.
https://boards.streamweaver.app/showthread.php?tid=13750
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=565174
https://planeswalkers.org/viewtopic.php?t=96815
https://democratstoughlove.com/showthread.php?tid=2712
https://phantom.everburninglight.org/archbbs/viewtopic.php?pid=778945#p778945
https://www.ww2.site/forum/viewtopic.php?t=326207
https://my-mobile.eu/viewtopic.php?t=6371
https://democratstoughlove.com/showthread.php?tid=5083
http://forexam.ru/component/kunena/?func=view&catid=5&id=161785#161785
https://catrachosporelmundo.com/index.php?topic=29632.msg30147#msg30147
https://my-mobile.eu/viewtopic.php?t=11949
https://muchroom.ng/index.php?topic=19768.new#new
http://60.250.226.63/ipkb/viewtopic.php?f=41&t=1992188
https://democratstoughlove.com/showthread.php?tid=3337