I had I dream where Mario was in Delfino Plaza, and there was a Piant Piranha Plant near the shine gate. In the dream, Mario had to use graffiti to shoot at the Piranha Plant instead of water, and you needed to pay real life money to get packs of graffiti for FLUDD.
No select screens, and I raced around on Mario Circuit (don't remember well but character was green, maybe Yoshi or Luigi) and did this weird insane shortcut involving gliding to a part of the track above me.
I once dreamed that Mario had reached Bowser's Castle to save Peach, but this time he had to sneak around the enemies instead of defeating them. He climbed on the outside of one of the castle's towers. Unfortunatly he got spotted by some guards and fell all the way down again. Then Sonic popped up in his Super Sonic form and said: "Now I'll show you."