The best alternatives to WikiTrivia are Disrupt Cards, Timeline Expert, and Vassal. If these 3 options don't work for you, we've listed a few more alternatives below.
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Disrupt Cards is an incredibly stupid card game parody of the startup-tech world. The project was launched in October 2016 by a few friends who had never made a card game, or even been funny, before. Miraculous...
Timeline Expert presents you tweets from people you follow and asks you to guess who said what. The more you guess correctly, the higher your overall score is.