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Nintendo 64 - Command And Conquer 64 cheats

Cheat mode
Hit B, A, R, R, A, C-Right, Up, Down, A at the "Press Start" screen.
The sound will confirm the correct code entry. Go to the main menu and 
choose the "Replay Mission", then hit L to display all missions and 
R to choose your team. While playing a mission, tap L + R to show 
debug information. Tap L + R + Up to automatically win the mission 
or tap L + R + Down to lose.

Battle screen magnify:
Hold L and hit C- Down or C-Up to zoom in-out the screen.