You need :
TigerZZ RC tool (you can download here)
Browser: Firefox
flash 10 only

Instructions:
1)Go into Restaurant City.
2)Open TigerZZ RC tool.
3)Click Start
4)Click Scan
5)All the buttons should be clickable after 1-2minutes of scanning. If some buttons are not clickable, try serving a dish to a customer and Scan again.
6)Once they are clickable, click the cheats that you want to use.
7)The scrollbar is a speedhack.
8)The freeze helps you pause the quiz timer so you can check up the answer with the Quiz answers.txt included in the download package.
¡Enjoy!
Ps: watch this screenshot (traduction of the chinese):
Credits to : pwnthis.net