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Nintendo Wii - Metal Slug Anthology cheats

Unlock Special Music: 
Finish Metal Slug 1 through 5 and X on hard difficulty level with limited 
number of continues and also clearing Metal Slug 6 with limited continues. 

Unlock Tonko Art Gallery: 
Finish Metal Slug 1 through 5 and X on easy difficulty level with limited 
number of continues and also clearing Metal Slug 6 with limited continues.