An alternative way of unlocking Situations 02 through 10 is reach the indicated scores.

Unlock Situations 02 through 07:
Complete ALL 10 Stages of Situation 01

Unlock Situation 08:
Have a Total Score of over 4,200 points.

Unlock Situation 09:
Have a Total Score over 5,600 points.

Unlock Situation 10:
Have a Total Score over 7,200 points.

Unlock Situations 8, 9 and 10
Enter the following codes at the Title screen after completing Situation 1. To unlock Situation 9 you must first unlock Situation 8. To unlock Situation 10 you must first unlock Situation 9.

Unlock Situation 8:
L, R, Left, Right, Square, Circle, X, Triangle

Unlocks Situation 9:
Triangle, Down, Circle, Left, X, Up, Square, Right

Unlock Situation 10:
Right, Down, Up, Left, Circle, X, R, L