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'
and then you change value of money.
$10,000 Free Money:
While the game is unpaused, hit shift+4 ($) for $10,000.
Warning: Using this cheat will cause your marine tank water to become dirty!