Play the Yu-Gi-Oh Card Game online with this free game download. But first you need to download the free game file. Heres the on how!. Yu-Gi-Oh! Online is a 2D trading card game (TCG) MMO. to make a basic deck, but must purchase booster packs and pre-made decks using real cash. Play the official online Yu-Gi-Oh Duel Monster game, or try out one of these free If you do not feel like paying real money to duel online, try out any of these.