Sonic & Knuckles combined with Sonic the Hedgehog 2 is a platform game for the Sega Genesis. Players control Sonic and his sidekick Tails as they battle the evil Dr. Eggman, who is transforming animals into robots to construct the Death Egg. The objective is to collect the seven Chaos Emeralds to thwart Eggman's plans and restore peace.
Dr. Eggman (aka Dr. Robotnik) has returned, turning helpless animals into robots and forcing them to build his ultimate weapon, the Death Egg! But this time, Sonic has a friend that can help him: Tails! Find the 7 Chaos Emeralds and stop Dr. Robotnik’s evil scheme!