Yu-Gi-Oh! Master Duel was officially released on January 19, and while many expected the digital trading card game to be popular, few knew it would prove as successful as it has been. Yu-Gi-Oh! Master Duel is one of the most popular games on Steam, peaking over 100,000 concurrent players every day. Yet Yu-Gi-Oh! Master Duel hasn't even reached its full audience. Up until today, Yu-Gi-Oh! Master Duel hasn't been available on mobile devices. That's now changed.