Expert Mode: Win the game by finding all 15 dog tags. Start the game "Rear of Compound" (yellow Star) and save it directly at a time of 00:00:00 . Now the game starts off with loads of weapons and ammo and with very hard enemies. Secret Mode: Win the game by finding Roger's Knife and all 15 dog tags. After the ending sequence save the game. Now load the game (yellow Star) and the game will start with even more ammo and weapons and mich harder enemies.