During gameplay, type debugup to enable Cheat Mode. Dinosaurs will ignore you unless shot and while running hold Ctrl to run faster.
Remove 3-D objects
In "cheat mode" hold shift and press M release. Repeat to turn back on.
Slow motion
In "cheat mode" hold shift and press S to activate code then release. Repeat to turn off.
Fly Mode
While in "cheat mode" hold shift and press the L key. You can also press ctrl to move faster in the air. Repeat code to turn off.
How To Kill The T-Rex
Carnivores is a pretty easy game till it comes down to the T-Rex. If you though using cheats to kill him would be super easy, then think again. The only way to kill a T-Rex is to shoot him in the eye. The only weapon you can use that has the capability of an exact precise shot would be the sniper rifle. I used cheat mode to fly, cause' if you get anywhere near him on the ground, then your toast.