Yu-Gi-Oh! The Falsebound Kingdom

To get Obelisk the Tormenter, beat story mode once with Yugi Moto. He should appear as an item that you can summon once a round.

To get the Magician of Black Chaos, use the black luster ritual on the dark magician.

Go to any empty space and press the Konami Code: UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, and you'll hear a jokey sound.

On DREAM WORLD liberate MEMORY BRIDGE in the Yugi story.

When you get the Black Luster Ritual use it on Gaia instead on the Dark Magician to get the Black Luster Soldier.

To unlock the Eye of Ra, beat Marik while playing as Joey.

Win the story mode with both Yugi and Kaiba to unlock Joey.

To unlock Silfer's Orb, beat Kaiba's game.

To unlock the Soul of Oblisk, beat Yugi's story.

To unlock Jinzo, simply defeate Bakura in Mission 15. Espa Roba will then join your campaign, bringing with him Jinzo, giant mech soldier, and Cyber Saurus.