Sonic Generations 2
The game begins in a room that is dark. As a red eye lights up in the room, some sounds can be heard. While this is going on, Sonic Generations 2, who is older than he was in Sonic Generations, runs through Station Square. Suddenly, a black hole pulls everything into a gray place.
At the same time, modern Sonic and Tails help the evil plans of the Eggman, and the black hole pulls them both into the same gray world. It turns out that an unknown bad guy brought them to this world, and now they have to go back home. The three Sonics get Chaos Emeralds from the bosses and then meet Metal Sonic, who is behind this plot.
Metal uses the negative energy in the emeralds to change into his superhero form, and the two Sonics that follow him are also Super Sonic. After beating the robot, the three Sonics go back to their own world.
Use arrow key and try some key ( Shift, Enter, Z, X, A, S , Q, E, R, T, G, F, H ) to controls the game.