Yu-Gi-Oh! The Sacred Cards Unlockables (GameBoy Advance)

Yu-Gi-Oh! The Sacred Cards (released in Japan as Yu-Gi-Oh! Duel Monsters 7: The Duelcity Legend) is a Game Boy Advance game release by Konami based on the Yu-Gi-Oh! Franchise. The plot of the game more or less follows the Battle City storyline of the anime and manga. The player is a good friend of Joey Wheeler and Yugi Mutou and has entered the Battle City tournament with them. As the player progresses through the tournament on their quest to earn 6 Locator Cards, mysterious card thieves attack, controlled mentally by a man named Marik.

Eventually the player discovers Marik is after the Egyptian God Cards and enters the finals to stop him. In addition to Rare Hunters and other random civilian duelists in the game, players have the chance to duel Joey Wheeler, both Yugi Muto and Yami Yugi, Ryo Bakura, Mai Valentine, Seto Kaiba and Ishizu Ishtar. Minor duelists like Rex Raptor (Dinosaur Ryuzaki), Weevil Underwood (Insector Haga), and Mako Tsunami can be fought. The final battle of the game is for the Battle City Championship against Marik himself.

Unlockables

Hidden Duelists
After Everyone gets their 6th Locator cards, but before boarding the airship for the FInals there are two hidden duels you can participate in:

Duel With Bandit Keith - Go to the Pier. As soon as you enter the first screen go right, into the building. Bandit Keith will be waiting.

Duel With Magnum - Go to the Aquarium. Mai will tell Magnum that she will marry him if he can defeat you in a duel.

Rare cards
Barrel Dragon - Defeat bandit Kieth in Park

Blue Eyes Ultimate Dragon and Obelisk the Tormentor - Go to Blue-eyes White Dragon and defeat Kaiba in the art museum.

Cosmo Queen - Beat Ishizu at the Museum

Cyber Harpie - Defeat Magnum at the aquarium. Then right before entering the blimp to get to the finals, talk to Mai and she will give you Cyber Harpie.

Dark magician - Defeat Arkana in a duel.

Holy beast-selket - Defeat odion in the Quarter finals.

Insect Queen - Defeat Weevil in a duel.

Jinzo - Defeat Espa Roba in a duel.

Obelisk the Tormentor - Defeat Kaiba in the art museum.

Red Eyes Black Dragon - Defeat Joey at the card shop

Revival Jam - Defeat Strings in a duel.

Slifer the sky dragon - Defeat Yugi in the semi finals.

The legendary fisherman - Defeat Mako in a duel.

The winged dragon,Ra. - Defeat Marik Ishtar in the finals.

Zera - Defeat Bandit Keith at the pier

Here's a video showing the best cads in the game: