Finish the game while saving the two other characters (Jill saves Chris and Barry, and Chris saves Jill and Rebecca) and at the end of the game, save the file. When you play the saved file, you will receive the special key that unlocks the closet for more outfits.

Finish the game in less than three hours while saving the other characters and get the rocket launcher with unlimited ammo (save the file then play the saved file).

Double Ammo:

Select New Game, and highlight Advanced. Then, hold left or right on the D-pad until the text turns green. This code lets you receive double the amount of clips and ribbons you normally pick up. (Example: Each clip gives you 15 bullets. This code will change it to 30.)

Hints

Saving Ammo:

-Zombies: Fight solo zombies with one knife swipe to the front then run behind it, hit it with more swipes. Just try to maintain your position behind it (try to do this in an open area). *Note, the zombies generally revert to the 'puke attack' when fighting them with the knife.

Hunters:

Use the knife in a corner or close quarters. Wait until it lands, than charge it! Keep hitting it with your knife! It will take a swipe at you and then try to relocate itself, to get behind you. Do not let it. It takes some practice. This does work, but only against solo Hunters.