Begin your new game and play until Treasure Trove Cove is unlocked without transforming at Mumbo's hut in any world. Collect the Jigsaw piece from the Underwater Castle in Treasure Trove Cove. Enter the sand castle after lowering the water. Enter the following code on the floor tiles. You will hear the sound of a cow as confirmation each time a letter is entered. You will hear a sound if you have entered the code correctly.