The story behind this game revolves around the rivalry between Sonic the Hedgehog and Dr. Eggman, who has once again stolen the Master Emerald. Players must navigate through various levels to stop Dr. Eggman's evil plans and save the world.
Gameplay-wise, Sonic 2 In 1 offers a unique experience. Since it is a compilation of two games, there are no separate menus to switch between them. Instead, the game automatically switches between Sonic the Hedgehog 2 and Sonic the Hedgehog: Spinball when the system is power-cycled.