Go to the Flopside Pit Of 100 Trails. When you get to the end of the pit ( floor 100 ), you will face Shadoo. Beat Shadoo, and then about 8 treasure chests will come out of the ground. Open all of the treasure chests and you will get the Dark form of the people you play with, and the regular hero form. Then, flip in 3D with Mario. Look closly at the 3D bar, when you keep looking at it, it will not go down. So now, you can have fun with Infanite 3D action!