Rio Rex is another part of the popular Tyrannosaurus Rex fighting games series at Friv. This time the goal is to cause chaos in Rio de Janeiro, the biggest city of Brazil! Control your dinosaur, kill every human around and destroy all objects standing in your way! Eat pedestrians, bash buildings and take down helicopters to earn points! Find up to 3 hidden skulls in each levels for a higher score. Use W,A,S,D keys to move, use your mouse to aim and bite, click and hold to spit flames. Can you help your T-Rex destroy every object in this super cool Friv game online called Rio Rex?