Enter the following codes while playing.
[Shift]+[Alt]+$ - Extra $5,000
[Shift]+[Alt]+[F10] - All mission levels
[Shift]+[Alt]+[F9] - All sandbox levels
costadeldosh - Unlimited money
quickquickquick! - Fast building
allbuildings - All buildings
You can also press hold [Shift]+[Alt] and type allbuildings at the main menu to unlock all missions or [Shift]+[Alt]+U to unlock all levels.