Gimme some money:
Press L1 + Up, L1 + Down.

Gimme lots of money:
Press L1, Right, Right, L1, R1, Down.

No money :
Press L1 + R1, Down.

Restock the market with fossils:
Press L1 + R1 + Down.

Select dig-sites without stars:
Press Left, Down, Right, Up, L1 + R1, L1 + R1.

Increase rating :
Press Right, L1, Up, L1, L1, Down.

Three stars:
Press L1, R1, Down, Down, L1, Right.

Immunize dinosaurs:
Hold L1 + R1 and repeatedly tap Up.

Disease dinosaurs:
Press Down, Up, Down, Left, R1, R1, R1.

Stressed out carnivores :
Press L1, L1, L1, Left, Left, Left.

Prevent rampages:
Press L1, Left, Up, Left, Up, Left, L1.

Blow up car:
Hold L1 + R1 and repeatedly tap Up, Down, Up, Down.

50% DNA :
Press Down, R1 + Up.

100% DNA:
Press R1, Up, R1, Right, L1, Down.

0% DNA:
Press L1, R1, L1, Right, Down, R1.

All Research:
Press Down, Down, Down, Left, Right, L1, Down, Up.

Kill tourists :
Hold R1 and press Right, Left, Right, Left, Right.

Unlock all missions:
Press R1, Right, Right, Right, Right, R1.

Camera shoots bullets :
Press R1 + L1, Left, Down, Right, Right.

Dino Zombies :
Press R1, R1, R1, L1, Right.

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

Storm:
Press R1, R1, L1, R1, Down, Up, Down.

No storms :
Press R1, R1, Left, Right, Up, Right.

No Twisters:
Hold L1 + R1 and press Left, Right, then release L1 + R1, then press L1 + R1 again.

Create twister:
Press Left, Up, Right, Down, L1 + R1.

Kill dinosaurs :
Press L1, R1, Down, R1, L1.

Blameless deaths :
Press L1, R1, Left, Down, Down, Down, Down.

Happy visitors :
Press R1, Down, L1, Up, Up, Up.

Low security fences:
Press Down, Down, Left, Right, L1, L1, Up, Up.

High security fences :
Press L1, Left, Left, R1, R1, Right.

Destroy fences:
Press Up, R1, Down, L1, Left, Left.

Damage paths :
Press Right, Right, R1, R1, L1, Down.

Thanks to Revolution readers Grandgamecheata, and pEErElEsspris!

More information about Jurassic Park: Operation Genesis
More PS2 cheats and codes