In one of the caves located near the city of Rio in a cave, scientists found a dinosaur and were able to revive it. When transported to a special base, the dinosaur was able to escape. Now in the game Rio Rex we will have to help the dinosaur get out of the city. Our hero will run through the streets towards the forest. On his way will come across various obstacles that you will need to destroy. The dinosaur must devour people that you will come across. This will help you restore your standard of living. Soldiers will also attack the dinosaur. You controlling the hero will have to destroy them all.