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Nintendo DS - Ossu! Tatakae! Ouendan! cheats

Unlock Hard difficulty:
Finish the game in the normal difficulty setting. 

Unlock Insane difficulty:
Finish the game in the hard difficulty setting. 

Unlock ending picture and credits:
Finish the game on easy, normal, hard, very hard mode to see a 
special picture at the end of the credits featuring the Ouendan team.