Nintendo64
Command and Conquer

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

SELECT A STAGE
On the Title screen, where you see "Press Start"--enter the following code using the Control Pad:
B, A, R, R, A, C-Right, Up, Down, A.
There isn't any indication that the code has worked. 

Select "Replay Mission" from the menu and press the L Button to display all of the missions (the R button chooses which side you are playing).

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