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Nintendo Wii - The Legend of Spyro: The Eternal Night cheats

Unlock Dark Spyro:
Complete the Story mode once, then save the game when prompted.
Re-load your cleared saved game file and finish all five Dragons 
Challenges in the "Extras" menu to Unlock Dark Spyro. 

Change elements repeatedly until Dark Spyro when playing on the 
cleared saved game file. Dark Spyro has the Convexity element and 
Convexity Fury.