On a standard game you can have up to 60 dinosaurs at any one time. To change this, go to:
Program Files/ Universal Interactive/ Jurassic Park Operation Genesis/ Data
Find the file named Constant, and go to the section near the bottom labelled "IntConstants". Change the default number (60) for MaxDinoPopulation, and you can set it to have as many dinosaurs as you like.
This requires messing with game information
Go in My Computer/Local Disc C:/Program Files/Universal Interactive/Jurassic Park Operation Genesis/JPOG/Data/Units . Or, if you have a shortcut on your desktop, right click and go down to properties, open file location. Then go into Data/Units and scroll down until you see a bunch of .ini files with names like WT1crn90. Open with notepad/wordpad which ever you choose and scroll down. You will see
UnitsAllowed= 600 ;
Change the 600 to a higher number, I used 9999999999. Which is ten 9's. Now, continue doing this process with the following files below:
And there you go, now you have pretty much an unlimited amount of fences! Have fun without limits now!
If you want dinosaurs to fight just build 2 hatcheries and make them face each other then make any of these pairs
T-rex vs. Stego
T-rex vs. Trike
T-rex vs. Spino
T-rex vs. Anky
Then watch them fight when i did this T-rex mostly won but once all of T-rex pairs won. Happy fighting!
To toggle game data, go to my computer:Search, then type in search JPOG, and in the second bar(underneath the first one) then click search. After that, find a folder named DATA and double click it. Once in that file there will be lots of other txt files. If you open them (they will open with notepad) the're will be notepad and things like: Player start money=6000... Well... If you change it to Player start money=99999999, then you will start with loads of money! Also, if you open the file saying fsl hunt, the're will be other things like= No. of dig sites=5, if you change it to 9, you can unlock all digsites!
NOTE: Always make a backup file before editing it, as it may be saved onto you're game...
type up,[,down,[ type this continuesly and you will get a lot of money!
During gameplay, press, LEft up right down 
This cheat is to fill up the Fossil Market.Press "[,down,down,[,]". When you do this it fills up the fossil market, so you can buy stuff there. Note:This only works when you are actually finding stuff at a dig site.
Press ], Right, Right, Right, Right, ] during game play and all missions, excercises, and "Site B" will be unlocked. When you unlock it, choose the dig sites you want and then use the "Mr. DNA" code ( press ], Up, ], Right, [, Down) to set all the DNA for your dinosaurs to 100%. Now you'll be set to create a dinosaur island just like on Jurassic Park III!
Note: The following codes require the left square bracket "[" and right square bracket "]" keys to be pressed. A comma "," indicates that the previous key should be released before pressing the next key. A plus "+" indicates that two keys should be presses simultaneously. Note: Do not select anything before entering a code. The codes will not work with an item selected:
Gimme Some Money:
Press [ + Up, [ + Down during game play. $10,000 will be added to your finances.
Gimme Lots Of Money:
Press [, Right, Right, [, ], Down during game play. $250,000 will be added to your finances
Press [, [, [, Left, Left, Left during game play. All carnivores will become stressed.
Press ], Up, ], Right, [, Down during game play. This will set all excavated dinosaur DNA to 100%.
Press Down(3), Left, Right, [, Down, Up during game play. Everything will be researched.
Press ], Right, Right, Right, Right, ] during game play. All missions, exercises, and Site B will be unlocked
Press ] + Down, ] + Down during game play. A heat wave will occur.
Where's The Money?:
Press [ + ], Down during game play. Your finances will be reduced to zero.
Open To The Public:
Press Left, Down, Right, Up, [ + ], [ + ] during game play. You can now select your three digsites without the required stars.
Seal Of Approval:
Press Right, [, Up, [, [, Down during game play. Your park rating will increase by one star.
Press [, ], Down, Down, [, Right during game play. Your park will have a three star rating.
Press Down, Up, Down, Left, ], ], ] during game play. Your dinosaurs will become diseased.
Press [, Left, Up, Left, Up, Left, [ during game play. Rampages will no longer occur.
Hold [ + ] and repeatedly tap Up, Down, Up, Down during game play. One of your safari cars will blow up.
Press Down, ] + Up during game play. This will get you all dinosaurs from you're unlocked digsites to 55%.
Press [, ], [, Right, Down, ] during game play. This will set all excavated dinosaur DNA to 0%.
Hold ] and press Right, Left, Right, Left, Right during game play. All tourists will die.
Press ] + [, Left, Down, Right, Right during game play. You can now shoot from the safari cars by using the camera.
Press ], ], ], [, Right during game play. Dinosaurs will now appear to be the living dead.
Welcome To Melbourne:
Press ], ], [, ], Down, Up, Down during game play. The weather will get stormy.
Press ], ], Left, Right, Up, Right during game play. Storms will clear up.
Hold [ + ] and press Left, Right. Release [ + ], then press [ + ] again during game play.
Press Left, Up, Right, Down, [ + ] during game play. A twister will appear on the island.
Press [, ], Down, ], [ during game play. All dinosaurs will be killed.
No Red Tape:
Press [, ], Left, Down, Down, Down, Down during game play. If anyone dies, you will not get charged no matter if you are in emergency mode or not.
Press ], Down, [, Up, Up, Up during game play. Your visitors will be happy.
Press Down, Down, Left, Right, [, [, Up, Up during game play. Your fences will have low security.
Press [, Left, Left, ], ], Right during game play. Your fences will have high security.
Press Up, ], Down, [, Left, Left during game play. All fences will be destroyed.
Press Right, Right, ], ], [, Down during game play. All paths will be damaged. Note: Make sure there are no visitors on a path when this code is enabled.
Press [ + ] + Down during game play. The fossil market will instantly be restocked with fossils.
Note: in this cheat it is requested you edit game files. Go to the data folder in your JPOG game files. Go under FsIHunt.ini in the data folder. Find the line that says Maxchosen= 5. Change the 5 to a 9. Now go to your game, while there are no menus up push left, down, right, up, , . You may now unlock ALL dig sites.
While in gameplay press [, Right arrow, Right arrow, [, ], Down Arrow