Cheats:

 Type them in during the game:

 BLASTUM    unlimited troops
 ZESIR      invulnerable troops
 BIGREEN    unlimited credits

FunCheat:

 Put the C&C mission disk into the CD drive and start the game with

 C&C funpark.

 Now you have the pleasure to play against dinosaurs when you choose
 a new GDI or NOD game.