Cheat Codes
Press the following key combinations while playing for the desired cheat effect: 
CAMPAIGN GAME: 

Add $100,000
Press [SHIFT]+[ALT]+[C]. 

Increase Food Rating by 10%
Press [SHIFT]+[ALT]+[F] during the cooking contest. 

Win Scenario
Press [F11] then press [SHIFT]+[ALT]+[V]. 

All Shop Upgrades
Press [CTRL]+[ALT]+[E]. 

SANDBOX GAME: 

Add $100,000
Press [SHIFT]+[ALT]+[C].