Kre-O Cityville Mayhem's Prison Break Set Awesome prison is filled with bad guys just itching to escape! Build an entire maximum security prison! Dr. Mayhem is ready to wreak havoc on the city with his Kreon pals! With the Kre-O Cityville Mayhem's Prison Break Set, you can bring justice to CityVille - or at least try! The Sonic Motion Compatible set can be brought to life, and you'll have a shot at keeping these bad guys behind bars - just don't turn your back on them! For ages 7 to 14 years old! Requires 3 X 'AAA' batteries, not included!