YMMV: Yu-Gi-Oh! Forbidden Memories

  • Awesome Music: Seto Kaiba's battle theme, a techno song reminiscent of the Digimon World or Donkey Kong Country series.
    snakeisninja: Kaiba that son of a bitch gets the best cards AND the best music in the damn game! He gets a theme song, his own duel music, and variations of the first two for his future self! AND THEY ALL KICK ASS!
  • Breather Boss: There are a few examples in this game.
    • After you make it past the preliminaries in Kaiba's tournament, you'll duel Shadi, the fifth opponent overall. While the previous four opponents scaled up in difficulty, Shadi is a noticeable step down, having monsters with stats in the hundreds, and not having significant fusions nor magic/trap cards in his deck. He's pretty much the only opponent past the early game you're guaranteed to not need to grind for.
    • When you return to the past, the first mandatory opponent is the mage soldier, whose monsters only have stats in the mid thousands, as well as no significant fusions nor magic/trap/equip cards. He's much weaker than the past few opponents you dueled in Kaiba's tournament, as well as the opponents to come.
    • When you return to the past and must retrieve the Millennium Items from the high mages in the shrines, High Mage Secmeton of the sea shrine and High Mage Martis of the desert shrine will come off as this, especially if you dueled the other, more difficult high mages before them. Secmeton uses a whole deck of water monsters, the strongest of which, Crab Turtle and Suijin, only have 2500 attack each. Martis uses powerful fiends and spellcasters, that while still strong, do not get the field power bonus the strongest monsters of the other high mages have. This results in him fielding significantly weaker monsters than what the other high mages are using against you.
    • In the endgame gauntlet, Sebek is much easier than the high mages you dueled and defeated, as well as easier than the opponents to come. He uses machine and beast type monsters, with the strongest being Metal Zoa, and dueling him on a Yami field does nothing to boost his monsters. Most of his remaining monsters only have slightly more than 2000 attack, and he has no significant magic/trap cards nor equips.
  • Critical Dissonance: This game often gets criticized for its brutal difficulty and the amount of forced grinding needed to get pass certain areas. Despite this, it's treated rather warmly by fans who played it back in the day, and is currently listed as the fifth game of the top ten PS1 games on GameFAQs, despite barely having over a 50% review rating.
  • Cult Classic: Despite being infamous for its brutal difficulty (or perhaps because), this game still has quite a bit of fans to this day.
  • Ear Worm: The main battle music for the Kaiba tournament arc of the game. Part of the reason that part of the game is treated as one of the games high points, despite introducing a rather nasty Difficulty Spike, is because of that song.
  • Ensemble Darkhorse: The Meadow Mage. He's just a mook you only see on one screen in the game, yet he's the character that's remembered and talked about the most. With his amazing card drops, including giving most people their first Meteor Black Dragon, people have fond memories of extensively dueling him and gaining the cards that allowed them to finally beat the game.
  • Game Breaker: The magic card Raigeki, which just like in the TCG, destroys all of your opponent's monster cards with no cost to you. The major reason this is such a game changer is besides clearing your opponent's field, it leaves them open for a direct onslaught from the monsters on your field. A single Raigeki can break a stalemate and win you the duel in just that turn, and just like any other card, you can have three of them in your deck. Having multiple Raigekis can be vital to surviving the endgame, especially if you don't have any Meteor Black Dragons.
  • That One Boss:
    • High Mage Kepura is the most difficult of the high mages you'll face, and is as difficult as what you'll face in the endgame, using Gate Guardian powered up by the meadow you duel him on. With an attack over 4000, it'll take just two direct attacks from it to be defeated. Even the Meteor Black Dragon alone won't gain you victory here.
    • Seto 3 is also this, being the most difficult opponent in the game, having Blue-Eyes Ultimate Dragon and nearly every other extremely powerful monster, as well as the most powerful magic and trap cards.
    • Pegasus. By the time you face him, even with grinding, he'll still have some really good cards at his disposal, one of which is a Meteor B. Dragon, who the only way you can possibly beat if he gets it on the field is if you start scum'd for multiple Raigeki's, which Pegasus also has in his deck. (And, due to a glitch, he can sometimes have FOUR copies of them in his deck instead of the max three.) He also has dragon capture jars. In a game where dragons are likely going to be your main fighting force. If all that wasn't enough? True to the anime, he's programed to be able to see what cards are in your hand, as well as what cards you have face down, making him impossible to bluff. There's a reason he's considered one of the hardest bosses in the game... On top of that, he gives some of the best magic and traps in the game, meaning you're going to be fighting him a lot in free duel. Granted, by that point, you should have far better cards to face him with, but he can still prove to be a massive pain even then.
  • Unwinnable by Insanity: When trading with another player, you're not required to put up the same amount of cards the other player is trading (nor have to put up any card at all). As such, it's possible to trade all your cards in your chest, and while the game does not allow you to trade cards that are in your deck, the game does not disallow you from exiting the build deck screen with less than 40 cards in your deck. So if you were to trade without 40 cards in your deck, and traded enough cards away, you would not have enough cards left to fill out a 40 card deck. And since you can't have 40 cards in your deck, the game will not allow you to duel anyone, thus preventing you from being able to get more cards.