Hints
* Always keep moving. If you sit still, the robots will tear you apart.

* Use your side buttons as much as possible to avoid enemy fire. Sliding left or right at the last moment will cause missiles (even homing, smart and mega missiles) to miss you.

* Find the exit before you blow the reactor. The way out is not always the way you came in.

* Clear out your exit path before blowing the reactor. Time is tight when you're trying to get away. Having to duke it out can cost you precious seconds.

Strange Colors
Square, Triangle, Circle, Square, Square, Triangle, Circle, Circle, Square, Triangle, Square, X, Triangle, X, Square, Triangle

Cloaking Device
Triangle, Square, X, Circle, Square, X, Circle, Triangle, X, Square, X, Triangle

Brighter screen
Square, Triangle, Circle, Square, Square, X, Circle, Triangle, Square, Circle, X, Triangle

Shield Recharge
Triangle, Triangle, X, Square, Triangle, C, Triangle, X, Square, X, Triangle, X

Turbo
Square, Triangle, Circle, Square, Triangle, X, Square, X, Circle, Triangle, Square, X

+10 lives, Mega Weapons, all level access
Triangle, X, Square, Square, Triangle, Circle, Circle, Square, Triangle, Square, Circle, X

Invulnerability
Square, Triangle, Circle, Square, Square, Triangle, Circle, Circle, Square, Triangle, Square, X

Mega Weapons
Triangle, Square, Circle, X, Triangle, Square, X, Triangle, Square, X, Circle, Square

All keys
Square, X, Circle, Triangle, X, Triangle, Triangle, X, Triangle, X, Triangle, X

All level access
Triangle, Square, Square, Triangle, Circle, Circle, Square, Square, Triangle, Circle, Square, Square

(Do NOT pause before entering these codes)