If you fill a reel with symbols, an extra reel also opens up with up to 2 extra reels possible.
http://oldsite.giessen46ers.de/fantalk/vie...=5&t=181204
http://forum.fretky.cz/jak-ji-naucit-na-za...ne-t178165.html
https://friends-cyber.clan.su/forum/12-5993-1#6364
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http://sharecovid19story.com/viewtopic.php?t=2753010
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http://forum3.bandingklub.cz/viewtopic.php...5&t=1150707
https://neoternia.net/viewtopic.php?t=241441
http://forum.bandingklub.cz/viewtopic.php?f=13&t=1263921
https://sgs-game.com/forum/thread-213429.html
https://forum.zweb-apps.xyz/viewtopic.php?t=3292
https://debate.socialism.nl/forum/showthread.php?tid=174171
https://forum.arduionly.com.au/showthread.php?tid=107625
http://strada.bielsko.pl/1_lubelskie/forum...e-penize#545043
https://ufr-2020.front5.picapo.net/forums/v....php?pid=430133
https://theforge.tankdaddy.com/discuss/show...d.php?tid=40556
https://debate.socialism.nl/forum/showthread.php?tid=162797
http://forum.bandingklub.cz/viewtopic.php?f=24&t=1309747
http://www.prepody.ru/topic88127.html