New Super Mario Bros 2: Golden Coin Ghost

Okay, so one day I bought New Super Mario Bros 2 from a garage sale. I thought, "Who would put a 2013 game here?" but I bought it for $2.00 anyways.
When I brought it home I shoved it in my 3ds and turned it on. Strangely, my theme turned red instead of blue, and when I went to the select screen, it didntt make a jingle, instead, a laugh!
So I of course played it because I know so much about mario. So the title screen was shown. Strangely, all the coins on the screen were RED!!!
But, since imm a complete dumbass, I played it. There was no cutscene, it just took me to the world select. And the only level to play was the last.
It said I was on world 6-66 which of course isn't normal
So, to defeat bowser, the world was red and golden ghosts flew around. When mario touched one the screen said, "YOU ARE ONLY JUST A BOY. GET OUT."
I WAS SOOOOOO SCARED AND I TURNED THE GAME OFF, TOOK OUT THE CARTRIDGE AND THREW IT DOWN A SEWER.