From Wikipedia: A cargo plane flying over Isla Sorna is struck by lightning, and upon crashing, the dinosaur DNA it stored is spread across the island. The player then assumes the role of either Mark Hanson (a photographer) or Lori Torres (an ace pilot), and must wander around the island in a side-scrolling format, collecting DNA and avoiding dinosaurs.[1] In each level, the player's character has the ability to switch between a background and a foreground pathway. Switching between the two pathways allows the player to access weapons and DNA samples,[2] or to avoid oncoming dinosaurs. At the end of each level, the player will use the DNA that is collected in a short puzzle game, in order to create more dinosaurs. Completing this minigame will unlock more areas for the player to explore. At the end of the game, the military bombs the island, and the player escapes on a small plane, wondering if dinosaurs should really have a place in their world.
https://en.wikipedia.org/wiki/Jurassic_Park_III:_The_DNA_Factor