The only gameplay is playing against Yugi over and over again, and you start off with the most awful deck in the world. If you win a single game against him you earn a new card, and there's also a best of three mode to earn 3 cards at the same time, the best choice. And as you gain cards Yugi gets better decks too (The artificial intelligence is still really stupid though). It's not a terrible concept, and I would respect it for what it is, but most of the cards are terrible, and Yugi is not fun to play agaist. He has the Swords of Revealing Light so you can do shit for 3 turns, and if the game is particuarly boring he pulls out Exodia and insta wins. It's annoying. But the biggest gameplay defect is that the game keeps giving you cards that you already have enough copies of, so you get pointless extra copies instead of the cards that you are missing, it's BULLSHIT.

The good thing is that your cards get imported to the sequels, and those games are way more fun.