Get Double Attacks:

Attack the enemy from behind and you should get two attacks in a row.

Get A +72 Attack Booster:

Pay your debt to Nina and she will give you a +72 attack booster.

Unlimited Naolin Gold:

When on the carrier near the end of the game go in the door with the first aid symbol and look in the medicine cabinet and youll find a Naolin Gold. You can repeat this as often as you need.