At the Title screen when Push Start Button hold X Select Circle Start. Immdiately hold Up L2 while still holding the previous buttons. Then press Square.
Drive a Sheep
In School mode defeat all opponents then select School Mode free trial. Hold Select Circle before entering the Zero 4 11 course.
At the Push Start Button screen hold L1 L2 R1 R2. A sound will be heard. Keep holding the previous buttons while holding Up Triangle. Then press Start with all buttons held.