Unlock Situation 8, then at the title screen press Triangle, Down, Circle, Left, X, Up, Square, Right to unlock Situation 9.
Unlock Situation 9, then at the title screen press Right, Down, Up, Left, Circle, X, R, L to unlock Situation 10.
Press L, R, Left, Right, Square, Circle, X, Triangle at the title screen to unlock Situation 8.