More Money:
 During gameplay, press Shift + 4.
 
 HexCheat:
 Go to folder install Zoo Tycoon
 Click right mouse in zoo.ini ( Configuration Settings )
 Select Properties, click out Read Only then click OK
 Next, you open this file - zoo.ini - and then find line have this text:
 "MSStartingCash = 8888888
 MSCashIncrement = 100000
 MSMinCash       = 8888888
 MSMaxCash       = 9999999"