Sonic & Knuckles

Released on October 18, 1994, it is the fourth installment in the main Sonic the Hedgehog series and a direct sequel to Sonic the Hedgehog 3. However, due to time constraints and the cost of a large-memory-capacity cartridge, Sega split the game in two. The game follows Sonic the Hedgehog and Knuckles the Echidna in their respective quests to save Angel Island. Knuckles attempts to attack Robotnik, but is electrically shocked in the process, and is trapped with Sonic in an underground passage. Robotnik uses the power of the Master Emerald to fuel a giant mech, but Sonic uses the power of the Chaos Emeralds to transform into Super Sonic. Sonic flies in piloting the biplane Tornado and Knuckles hitches a ride to return the Master Emerald to Angel Island.