up up down down left right left right b a SELECT start
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Press up, up, down, down, left, right, left, right, b, a in that order for 30 lives
well if its up up down down left right left right b a b a start then its the 30 extra lifes code for contra on the nes
popeye for the famicom (nes in japan)
http://www.racketboy.com/retro/nintendo/nes/2008/03/best-nes-emulator-for-nintendo-ds-nesds.html
If your MP5 supports '.nes' games like mine does, then try downlading .nes ROMs... .nes are originally Nintendo Entertainment System files.