Jurassic Park - Operation Genesis cheats and cheat codes for Playstation 2

Cheat mode:
While playing game, enter the following button combination cheats:
Note: Do not select anything before entering the codes. 
The cheat may will not work with an item selected.

Unlock all missions, exercises, and Site B
Press R1, Right, Right, Right, Right, R1. 

Additional $10,000
Press L1 + Up, L1 + Down

Finances reduced to 0:
Press L1 + R1, Down.
In PAL version: Press L1, R1, L1, R1, Down, Down

Market Day
Press L1 + R1 + Down
In PAL version: Press Down, L1, R1, Down

Unlock all research
Press Down, Down, Down, Left, Right, L1, Down, Up.

Select digsites without stars:
Press Left, Down, Right, Up, L1 + R1, L1 + R1.

Set dinosaurs DNA to 55%
Press Down, R1 + Up.

Set dinosaurs DNA to 100%
Press R1, Up, R1, Right, L1, Down.

Shoot from safari cars:
Press R1 + L1, Left, Down, Right, Right.

Rampage Time
Press L1, L1, L1, Left, Left, Left.

Zombie dinosaurs:
Press R1, R1, R1, L1, Right.

Heat wave:
Press R1 + Down, R1 + Down.

Stormy weather
Press R1, R1, L1, R1, Down, Up, Down.

Twister reach the island:
Press Left, Up, Right, Down, L1 + R1.

Extinction Event
Press L1, R1, Down, R1, L1.

No Red Tape
Press L1, R1, Left, Down, Down, Down, Down.

Guaranteed dinosaur immunity
During game play, hold L1 + R1 and repeatedly press Up.
In PAL version: press Up, Up, R1, L1, Up, Up

Blow up safari cars
During game play, hold L1 + R1 and repeatedly press Up, Down, Up, Down. 
In PAL version: Press R1, L1, Up, Down, Up, Down

All tourists die:
During game play, hold R1 and press Right, Left, Right, Left, Right. 
In PAL version: Press Left, Right, Left, Right, R1

No Twisters
During game play, hold L1 + R1 and press Left, Right. Release L1 + R1, after 
press L1 + R1 again. 
In the PAL version of the game, press Left, Right, L1, R1


Untested cheats:

$250,000
During game play, press L1, Right, Right, L1, R1, Down

Increase park rating by one star:
During game play, press Right, L1, Up, L1, L1, Down


Park with 3 Stars:
During game play, Press L1, R1, Down, Down, L1, Right 

Sick dinosaur:
During game play, Press Down, Up, Down, Left, R1, R1, R1

No more rampage:
During game play, Press L1, Left, Up, Left, Up, Left, L1

Exodus:
Set dinosaur DNS to 0%
During game play, Press L1, R1, L1, Right, Down, R1

End of storm:
During game play, Press R1, R1, Left, Right, Up, Right 

Happy visitors:
During game play, Press R1, Down, L1, Up, Up, Up

Low securtity fences:
During game play, Press Down, Down, Left, Right, L1, L1, Up, Up

High securtity fences:
During game play, Press L1, Left, Left, R1, R1, Right

Destroy all fences:
During game play, Press Up, R1, Down, L1, Left, Left

All path damaged:
During game play, Press Right, Right, R1, R1, L1, Down



Unlock Site B option in main menu:
Finish all missions

More visitors
Build 4 or 5 entrances on all different sides.

T-Rex: DNA:
To get some T-Rex DNA, unlock Judith River Formation B and put your dig teams 
there. They will find T-Rex remains.