Upgrade All Weapons
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, then push Start to fully upgrade all your weapons. Of course, with great power comes great carnage, and this code can only be input once every level. Another this to remember is that the code doesn't work on the 'Easy' setting.

99 Lives
To get 99 lives, jump onto the spikes and/or into monsters gaping maw. Haha, only kidding. It's simple but hard - you must basically lose a life or kill off your soldier exactly when gain an extra life. This should give you 99 lives. One to do this is by killing the mini-Boss in Level 1 because you usually get an extra life. Get hit by one of the fireballs it shoots the instant you destroy it.

Challenge Mode
Successfully complete the game to unlock Challenge mode.

30 lives in NES Contra
Before the demonstration begins at the Contra title screen, press Up, Up, Down, Down, Left, Right, Left, Right, Y, B, Start.

Hard Mode in NES Contra
Successfully complete the game to begin a new game in Hard mode.

10 Lives in NES Super C
At the Super C title screen, press Right, Left, Down, Up, B, Y.

Sound Test in NES Super C
As the game's logo is fading at the Super C title screen, hold Y + B and press Start.

Challenge Mode Bonuses
Successfully complete the indicated number of challenges to unlock the corresponding bonus:

NES Contra: 4
NES Super C: 8
Probotector character: 12
Nobuya Nakazato interview: 16
Lucia character: 20
Contra 3 comic: 24
Sheena Etranzi: 28
Jimbo and Sully from Contra 3: The Alien Wars: 36
Sound Test option: 40

Alternate Colors
Successfully complete the game. At the character selection screen, press Up or Down to choose an alternate color.

Alternate Ending
Successfully complete the game on the Normal or Hard difficulty setting to view an alternate ending.

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