Beating Rebecca, Panik, and the Millennium Guardian at the start of the game, given how poor your starting deck is.
Minor manga character Hanasaki dresses up as a superhero to kick out one of the Neo Ghouls, and wins.
When dueling Arkana, your character gets the option of an awesome line.
Arkana: I'll give you two choices. Do nothing but watch this stunning show as I defeat this woman... Or step in and be magically defeated by me! Player: I'll let you surrender.
If you pick the other option, Arkana gets an awesome comeback.
Player: I'm going to win! Arkana: Are you that anxious to be humiliated?! I will have you begging on your knees before it's over!
When the Neo Ghouls take over the Egypt Exhibition, you have to battle your way through 4 opponents without being able to heal in between. Clearing this challenge makes Yugi and Joey declare that you are an awesome duelist.
Seto Kaiba takes out 7 Neo Ghouls by himself, one after the other.
Due to looping sprite animations, Para and Dox can backflip up flights of stairs.
Yami Yugi, after being out of commission for nearly the entire game, unleashes the full power of Ra on Bandit Keith, frying him with a lightning bolt.
Reshef possess Bandit Keith and makes him break the Millennium Puzzle, allowing Para and Dox to steal it—and Mokuba.
Defeating That One Boss, Marik, to unlock the true power of the Winged Dragon of Ra.