Ok, so in Contra 4 the DS game, if you complete a few challenges, you unlock the original NES Contra game,

However, I cannot get the Konami code to work in the unlocked game?? Any tips??

Play it without cheating.

Check around to see if it's possible in this version. If not, play it normally.

Maybe they changed it up or took it out?

Rooster - some people just want to experience the and finish it, that comment is purely ignorant.

Nah, he's cool... When it comes to Contra... I'm a cheater... No worries

If someone just wants to experience the game and finish it, then there are alternatives.  You're the one who sounds ignorant making a bunch of assumptions.

Your logic is as sound as those claiming that it's ruining their experience because it's the way they want to play.

I'm explaining the logic you just posted, beautiful mind.

http://www.gamefaqs.com/ds/941461...

looks like it got changed up a bit

Yeah, the NES Contra and Super C included in Contra 4 are blatant ROMs running on an emulator based on the PocketNES code. The Konami Code (and Super C's lives code) is therefore there, just modified to map to the DS controls.

Hybrid's gamefaqs link explains what to press for this version of the game.

Mystery solved!