Sonic the Hedgehog

Sonic the Hedgehog (also know as Sonic 4) is an unlicensed game for the SNES by Peruvian scene organization Twin Eagles Group. It is, actually, a hack of Speedy Gonzales: Los Gatos Bandidos. Notable features include Sonic's new ability to kick, and missions to free Mario from cages (upon which the latter exclaims his name).

Dr. Robotnik is on vacation, but he's still planning to take over the world, and this time he's built several robotic copies of Mario. However, the robots eventually turned good and turned against their creator. With a new army of feline henchmen, led by Captain Robocat, Robotnik's plan ensues, so Sonic must unleash the Mario robots to help him defeat Robotnik's entire army and have the final battle against Robocat.