There was a topic for this already, but I'll make a cheat.
A New Quest
Beat SM64 and SM64DS at 100 percent while eating a bag of Salt and vinegar chips. Then during the ending cinema, Quickly beat half of SMB before the cinema is over. (Beat world 4-4.) Then when Mario says Thanks a much for a playing my game or something like that, take a picture of the cake and take it to any bakery. Tell them to make a cake EXACTLY like that but they don't need to make the Mario and Peach figures. Hurry home and make the Mario and Peach figures yourself. Dress up as Mario and return to the bakery and take the cake. Give the Baker 999 coins, (or 1000 if you are in Japan.) Return home and eat 99.98 percent of the cake. put .01 percent of the cake on the picture of the cake that has the Mario and Peach figures. The tv with SM64 will turn on and your DS will magically come to you. You will be sucked into SM64 and your DS will split in 4. They will turn into Mario, Luigi, Yoshi, and Wario. Now the game will have new missions and you will have to collect 270 stars. WARNING!! if you lose your 5 lives in the game, you will die in real life so seek a lot of 1-up mushrooms.
I Heart my best friend...Mario!