At the main menu, press Up(2), Down(2), Left, Right, Left, Right, B, A. If you entered the code correctly, you will hear a meow.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
- Bravery (15 points): Use only your knife to beat the Harbor Level.
- Fair Fight (10 points): Reach the mortar without defeating any unarmed soldier in Missile Base.
- Good Start (10 points): Complete the Missile Base.
- Knife Master (20 points): Complete all levels using only your knife and no powerups.
- Mad Marine (30 points): Rescue the POWs twice.
- Not Bad (10 points): Get a score of 50,000 or more.
- Reflexes (15 points): Complete the Missile Base without dying.
- Stamina (15 points): Complete the Bridge Level.
- Stealth (15 points): Complete Missile Base, deafting less than 18 enemies.
- Teamwork (20 points): Score 200,000 or more playing an Xbox Live co-op match.
- True Marine (20 points): Rescue the POWs in less than 10 minutes.
- Victory (20 points): Beat the Enemy Prison Camp.
- Fair Fight (10 points): Reach the mortar without defeating any unarmed soldier in Missile Base.
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