Yu-Gi-Oh! The Falsebound Kingdom Unlockables

Play as Kaiba. After you complete the first level, if you liberate every village, you will have unlocked him.

On Kaiba's campaign, play the Dragon Lair mission. After defeating Lord of D. at Fort Hall you will get Seiyaryu.

On Joey's campaign, play the Quick Attack mission. Wander around the mountains to the right of the base Beyzon and you should encounter Sengenjin and Flame Cerebrus. There are only two of them.

Play the Joey campaign. Go to the mountains behind the main castle. REMEMBER: Only one castle is occupied. Wait until it gets dark then walk up behind the occupied castle and near the highest mountains to find Serpent Night Dragon. After defeating him, you also get a Swordstalker and an Invitation To A Dark Sleep.

In the first level on the Yugi story mode, wander around in the trees. You will be ambushed by a Silver Fang. It has about 750 health and should not give you trouble. When you defeat it, it joins your army.

On the mission where you fight Kaiba (the last mission in Joey's campaign), walk around at the bottom of the mountains closest to Kaiba near Fort Ru-Ma-Pann to find Skull Night, Kazejin, and Pumpkins The King Of Ghosts.

Finish the game with Kaiba.

Finish the game with Yugi.

On Yugi's Campaign, play the Scorched mission. Travel right toward the mountains where the ocean sticks out the farthest on land. You will meet those three monsters.

In the Yugi campaign's Badlands mission, go to Tower-Pegasi. Defeat Summoned Skull then make a trip to Tower-Deneb. In the wasteland in between the towers, you will find this team: -Beast of Gilfer, Illusory Gentleman, and Neck Hunter. Defeat them and they will be yours.