Enter the following password into the cheat menu to unlock: TEXAS
Bonus Level
Go to the cheats menu and enter ZOO. You shall now be able to go to a zoo and practise killing dinosaurs which don't attack you.
Charged Hit
Hold down the attack button.He will turn around the club and it will hit harder,and will do more damage.
Infinite Ammo
Enter the following password into the cheat menu to unlock: MADMAN
Invincibility
Enter the following password into the cheat menu to unlock: EMERPUS
Invisibility
Enter the following password into the cheat menu to unlock: SLLEWGH
Level select
Put "sellout" in cheat code menu.
Play as velociraptors in multiplayer
Go to the CHEATS menu on the main menu and then go to enter code and enter JURASSIC then go on multiplayer and check all the characters they should be at the very end.
See-Thru Dinosaurs
After you kill a dinosaur and it is laying on the ground, kneel next to it and walk into it. If you do this before the dinosaur disappears, you will be inside the dinosaurs body. You can go into the tail, the middle, or the head. (Note: this also works with large un-dead dinosaurs.)
Unlock All Levels
Enter the following password into the cheat menu to unlock: SELLOUT
Unlock Everything
Enter the following password into the cheat menu to unlock: FMNFB