Sonic mania Dark

I had bought sonic mania plus for my nintendo switch then i played the game the title had sonic doing his finger pose then the word dark popped down instead of plus i didn,t care about it. As i was going to pick my character i saw that all their faces were sad and tears in their eyes i played as sonic. I got to angel island but it had fire buring like sonic 3,s angel island.Then the phantom ruby came it was green instead of pink it teleported sonic at studiopolis it looked rusty then i fought heavy gunner but each time a missle hit an eggrobo blood went flying.After i defeated heavy gunner it sent me to press garden act 2 but the background looked weird the trees were dead with little snow.Then i fought heavy shinobi he only took 2 hits to be defeated then eggman warped me to oil ocean i said wasn,t eggman going to warp me to stardust speedway?. I played oil ocean act 1 and 2 both acts had blood instead of oil.In act 1 i fought metal sonic but was in his phase 2.Then in act 2 it cut the level out and i got to heavy magician but it took 6 hits to defeat it after when i defeated the boss blood was flying all over.I got to lava reef it had organs bones and blood on the floor that was when sonic was crying the crying was like a human,s crying i got to the boss heavy rider and heavy king they both took 3 hits to defeat.Then i got to titanic monarch but i didn,t do metallic madness i said there was only one act and that was act 2 then i fought the final boss i hit 8 hits to beat it then eggman was crying a human cry like sonic.Even i got all the chaos emarlds but it didn,t send me to egg reverie.Instead i got on the car with tails knuckles mighty and ray.While sonic and friends escaped then the phantom ruby broke into blood when eggman was left there to die and was still crying a human cry while the titanic monarch exploded.Then the screen went black then it got to the main menu.