To get unlimited money:press - Theme Park World
To get unlimited money:press left,down,x,circle press the code 9 times while you are in a theme park
To get all items researched:hire a researcher and press up,down,up,down,left,up,down,up,down, right. Press this code 9 times while you are on a theme park
To get 255 gold tickets:press up,down,left,right,circle,right,left, down,up,circle.press this code 5 times while you are on a theme park.
Every time you enter a cheat you will hear a sound sort of like when you get an upgrde done to a ride.
I hope these are helpful
p.s the cheats sent in by ups and downs are wrong, I know, I tried them.....!