Ultimate Spider-Man - Platform: Nintendo DS

Defeating Electro:
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When you fight Electro, about half way through the game, hit him with 
your tendril. When he turns blue, use the stylus to throw blue mail boxes 
and the car. The car will respawn if you destroy it. If he gains health, 
use the tendril when he is red to take out the street lights. The lights 
will flicker after you hit them, but if they are not out he can use them 
to regain health.

Play as Carnage:
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Get a 80% game completion to unlock Carnage in Multiplayer mode.

Play as Symbiote Spider-Man:
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Get a 100% game completion to unlock Symbiote Spider-Man (black costume) 
in Multiplayer mode.