Enter the following codes to unlock the corresponding effect.

Unlock Level Select:
Enter Square, Circle, X, Triangle, Triangle, X, Circle, X. Any level up to level 30 can now be selected.

Unlock Bonus Level:
Enter Square, Square, Square, Triangle, Circle, Triangle, Square, Square.

Unlock Weapons:
Enter Square, X, Circle, Square, X, Square, Circle, Square.

Unlock Infinite Lives:
Enter Circle, X, X, Triangle, Square, Triangle, Square, Circle.

Unlock Hidden Ship:
Enter X, X, X, Square, Triangle, Circle, X, Triangle.

Unlock Firewalls:
Enter X, X, Square, X, X, X, Triangle, Triangle.

Unlock H²o Mode:
Enter Circle, X, Square, Triangle, Triangle, Circle, Triangle, Circle.

No Bonus Points Reset:
Enter Square, Triangle, X, Triangle, Circle, Square, Triangle, X.

Disable Cheats:
Enter Square, Square, X, Circle, Circle, Circle, Circle, Triangle.


Unlock Levels
Enter the following codes to unlock the corresponding level.

Unlock Level 3:
Circle, X, Circle, Circle, Square, Triangle, X, Triangle.

Unlock Level 4:
Circle, Circle, Triangle, Circle, Triangle, Circle, Square, Square.

Unlock Level 5:
Square, Triangle, Square, Triangle, Square, Triangle, Triangle, Circle.

Unlock Level 6:
Square, Square, Circle, Square, Triangle, X, Triangle, X.

Unlock Level 7:
X, Triangle, Circle, Square, X, Triangle, Circle, Triangle.

Unlock Level 8:
Square, Circle, Circle, Triangle, Triangle, Square, Triangle, Square.

Unlock Level 9:
Square, Circle, X, Triangle, Square, Square, X, Circle.

Unlock Level 10:
X, Triangle, Square, Circle, Triangle, X, X, X.

Unlock Level 11:
Circle, Square, Triangle, Square, Circle, Triangle, Square, Triangle.

Unlock Level 12:
Circle, X, X, X, Triangle, X, X, Square.

Unlock Level 13:
Square, Triangle, Triangle, Circle, Circle, X, Circle, Circle.

Unlock Level 14:
Square, Square, Triangle, Circle, Circle, Triangle, Circle, X.

Unlock Level 15:
Circle, Triangle, X, Square, Circle, Triangle, Triangle, Triangle.

Unlock Level 16:
Circle, Square, Triangle, X, Circle, Circle, Circle, Square.

Unlock Level 17:
X, Circle, Triangle, X, Square, Square, Square, Circle.

Unlock Level 18:
Circle, Triangle, Circle, Circle, Triangle, Square, Square, X.

Unlock Level 19:
Square, X, Circle, Square, Circle, X, X, Triangle.

Unlock Level 20:
Circle, Square, Triangle, Square, Square, Square, Square, Square.

Unlock Level 21:
Circle, Circle, Circle, Circle, Triangle, X, Triangle, Circle.

Unlock Level 22:
Circle, X, Circle, Triangle, X, Circle, Triangle, X.

Unlock Level 23:
Square, Square, Triangle, Circle, Triangle, X, Circle, Triangle.

Unlock Level 24:
Circle, Circle, Square, Triangle, Square, Triangle, Triangle, Square.

Unlock Level 25:
Circle, X, Triangle, X, Square, Triangle, X, Circle.

Unlock Level 26:
Square, Circle, Circle, Circle, X, Circle, X, X.

Unlock Level 27:
Square, Square, Triangle, Circle, X, X, Square, Triangle.