Things You'll Need
Instructions
Load "Little Big Planet," and enter the creation menu. Select an already existing map to load, or begin a new one.
Enter the map, and open your "Popit" menu by pressing the square button on the controller and selecting a building material to create walls of the underwater room.
Open the "Popit" menu again, and select the Tools Bag. Scroll to the "Global Controls" menu where you will find the water settings.
Adjust the water level, color, wave strength and murkiness. Water will fill the map, leaving you with an underwater room.