Sonic: Mass Hysteria (2018 Game)

Sonic: Mass Hysteria is an unofficial 2018 sequel to Sonic Mania made to coincide with the upcoming Sonic The Hedgehog Movie.

Synopsis
Doctor Robotnik has unleashed destruction onto south island with the Seven Chaos emeralds. Sonic, Tails, Amy, and Knuckles all have to travel through 12 zones to stop him.

After 8 zones, Robotnik kidnaps Amy with the help of Metal Sonic and Zero. After launch base zone, Sonic, Knuckles, and Tails confront Agent Shadow who has been brainwashed by Robotnik. After defeating him, Sonic, Tails and Knuckles fly to the Wing fortress zone in the egg fleet as they confront Metal Sonic. After an Adrenalin pumping chase, Sonic destroys Metal using the drop dash on the front of the tornado's blades. Meanwhile, Knuckles rescues Amy as she destroys Zero with her piko hammer.

Sonic then gives chase to Robotnik into the death egg via the Sky base, beginning zone 11. Two acts later, Robotnik challenges Sonic in Zone 12: The Egg gauntlet. Where sonic must battle every boss in the game from Zone 1 to Zone 8. After this, Robotnik escapes from sonic in his large mech, but Sonic and tails catch up to him in the tornado. After fighting Robotnik in the mech's interior (which crashes through the death egg) Robotnik captures Sonic as the base explodes, knocking the death egg off it's axis into mobius, leavng Tails to die.

Enraged by his friends death, Sonic attacks Robotnik as he falls to his supposed death. But he is saved by Metal Sonic, who is then destroyed by Shadow. Who has seemingly regained his memory. Sonic then transfors into his super form as he stops the Death egg from crashing into the island as it explodes. He then falls after turning back as he is saved by Tails, Knuckles, and Amy in the tornado.

In the post credits scene, Robotnik flies away in his jetpack as he laughs. The words "THE END"? Are then shown.