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Cheat Codes[edit]
Konami Code: Upgrade Weapons[edit]
When you have collected a weapon or two, press 
and enter the Konami Code: 
, , 
, , 
, 
, , , 
, 
, . Be careful not to enter it again or you will die, but after a continue you can enter it again safely.
Classic Contra Codes[edit]
Here are the cheats for the unlockable NES games, the original Contra and Super C.
Unlockables[edit]
To unlock Challenge Mode you need to beat the game on any difficulty.
| Unlockable | How to Unlock |
|---|---|
| Contra (NES) | Beat 4 challenges in Challenge Mode |
| Super C (NES) | Beat 8 challenges in Challenge Mode |
| Probotector (Character) | Beat 12 challenges in Challenge Mode |
| Nobuya Nakazato Interview | Beat 16 challenges in challenge mode |
| Lucia (Character) | Beat 20 challenges in challenge mode |
| Contra III Comic | Beat 24 challenges in challenge mode |
| Sheena Etranzi (Character) | Beat 28 challenges in Challenge Mode |
| Contra 4 DS Promotional Comics | Beat 32 challenges in Challenge Mode |
| Jimbo & Sully (Character) | Beat 36 challenges in Challenge Mode |
| Extras Museum and Sound Gallery | Beat 40 challenges in Challenge Mode |