To Gain extra levels you must collect all the GTA shields.
How To Find Tanks
To find the tanks just stay at the main menu for about 60 sec's, after that a demo
should appear showing you the way to the tanks.
To Make the loonies crazy, you must first find an Icecream truck then proceed to the
loonies base with the music playing. When they here the music they will begin running
an dancing around like little school girls.