Spartan online slot Spadegaming 859$
 

The answer is the creation of hybrid games that offer parts of both options - standard casino games of chance, but with an element of trivia added on.
http://www.lada-xray.net/showthread....101#post206101
https://mmomakemoneyonline.net/threa...synowe.503451/
https://www.chargersixpackforum.com/...F%BF%BD.85370/
https://mmomakemoneyonline.net/threa...os-oss.501415/
http://60.250.226.63/ipkb/viewtopic.php?f=41&t=1944836
http://www.prepody.ru/topic58340.html
https://mmomakemoneyonline.net/threa...ndroid.387873/
https://gravatar.com/generously5e76df540c
https://cityoftowers.ucoz.ru/forum/7-204-1#861
http://strada.bielsko.pl/1_lubelskie...p-jatek#565517