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Nintendo DS - Eyeshield 21 cheats

Unlock NASA Aliens Team:
After story mode ends, this team will challenge you. Beat them.

Unlock Kengo Mizumachi and Shun Kakei characters and poseidon clothes:
Finish story mode with the GBA Eyeshield 21: Devilbats Devildays game in your cartridge slot.
To take on Kyoshin Poseidon clothes, press L while choose an edit team with 
Shun and Kengo in it.