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The Konami Code works in all versions of the collection, but the actual button inputs at the end will vary based on which system you have.
Note that these will be slightly different depending on which version of the game you’re entering it for. Some use the shoulder buttons.
If you are entering a cheat code, you will need to end it quickly on the title screen for that game, while the game’s title is displayed.
The Japanese versions of the games have additional cheat codes that can be used, while other versions have only a couple that work.
Contra: Hard Corps has multiple endings. There are four different main endings you can get to the story, one secret ending, and one bad ending. These will be determined by with paths you take and which stages you play, particularly the choices at the end of Stage 1 and Stage 4, although the actual length of the routes depend on which ending you’re working toward.
Ending A – Go after Deadeye Joe at the end of Stage 1 and then choose to surrender at the end of Stage 4.
Ending B – Go after Deadeye Joe at the end of Stage 1 and then choose to fight at the end of Stage 4.
Ending C – Rescue the Center at the end of Stage 1 and then surrender at the end of Stage 4.
Ending D – Rescue the Center at the end of Stage 1, choose to fight at the end of Stage 4, and refuse to join the colonel in Stage 7.
Secret Ending – In the second part of Stage 3, climb up the wall above the first door instead of shooting it open, and tell the alien that you’ll give the arena a try. This activates a special stage that leads to the secret ending.
Bad Ending – Rescue the Center at the end of Stage 1 and then choose to fight at the end of Stage 4, but agree to join the colonel in Stage 7. Getting this bad ending will use up your lives but let you use a continue.