In the Industrial Castle level after Pipistrello's Cave, there's a large enemy with the Cardinal Animal Orb. The Cardinal finds secret hidden items. With the Cardinal go to the Full Moon level after Medusa's Lair. The Cardinal will find and give you the key in the second hut just before you go to the Snow World Level. The Key Sword opens the last door in the Animal Ark and unlocks the Berserker animal (he gives you a magic boost).
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you dig it up in the top right corner of the room where you find the meat weapon in the ice castle (there is no X)
Castle Crashers is not available on the PSP.
Just kill the painter bosses paintings in the castle crashers
First, go to the Industrial Castle level and get the Cardinal. Then go to the Full Moon level and get about halfway through it to the two huts right before you get to the Snow World mission. The Cardinal picks up a sword shaped like a key. Use the key and hit the door. The lock falls off and you can go in.
Tom Fulp