Yu-Gi-Oh! Forbidden Memories doesn't follow the storyline from the television series, instead it follows an alternate storyline that deals with the Phaoroah, whom you're in control of, trying to save his kingdom from Henshin, who's trying to take over the world using the powers of darkness. As the Phaoroah, you spend your time dueling against characters from the television series for cards and the like.
Dueling in Forbidden Memories is something else. Instead of following the rules from the actual card game, any monster card can be played without tribute, etc. Certain magic and trap cards are either strengthened or weakened. There's nearly no strategy required as long as you have powerful monsters with high attack, etc victory is easy.
The visuals in Yu-Gi-Oh! Forbidden Memories are medicore. But when it comes to monsters battling it out in 3-D, a feature present during duels, it's sub-par. The music in Forbidden Memories is alright, alternating between tense and calm between duels, talk scenes, etc.
There are a few special features in Yu-Gi-Oh! Forbidden Memories that are worthy of mention. If you have enough star chips, which are earned through duels, and know the code for certain cards, you can automatically add that card to your collection. The drawback is that the game requires a ridiculous amount of star chips for some cards, while for others it's cheap.
I wouldn't really recommend this game to anyone unless they're a Yu-Gi-Oh! fan or enjoy collectible card game.