Wings of Wor

Wings of Wor Easy Mode
Go to the Options screen and highlight Game Level. Now hold down A + B + C and press Start.

Wings of Wor Level Select
Go to the Options screen and highlight Control. Now press and hold A for about ten seconds.

Wings of Wor Unlimited Credits
When the "Game Over" message appears, hold Left + A + C until the continue screen appears. This will allow you to continue without losing any credits!