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Duke Nukem

Invulnerability

Enter UP,DOWN,DOWN,LEFT,RIGHT,LEFT,UP,UP at the title screen.

Note: If you want both Invulnerability and Level Select, you must enter this code first.

Level Select

Enter LEFT,RIGHT,UP,UP,DOWN,UP,RIGHT,LEFT at the title screen.

Rapid-Fire Gun

Go to the diagonal platform at level 4. Then repeatedly press A to remain on the platform long enough to find the rapid-fire gun.

Avoid falling damage

If you fall a great distance then pause and then un-pause just before you hit the ground to stop yourself from recieving damage.