How to get to another city when it is not unlocked
Heres a tip to go to other cities when you havent unlocked them yet (when you get 4 stars for going to the other cities). You must put in the never get stars cheat (circle,right,circle,right,left,square,triangle,up) then use jetpack cheat (L1,L2,R1,R2,up,down,left,right,L1,L2,R1,R2,up,down,left,right) then fly to other city and you wont get stars hope this works for you like it worked for me.
PS. These cheats are not fake.
Added by: JoelDR Sep 28th 2012, ID#34131