I-Ninja Cheats (PlayStation 2)

The order of belts the Ninja will recieve is:

White

Yellow/Gold

Green

Blue

Red

Black

You must earn a certain number of Grades to get the next belt.

 

 

To get all the grades first you finish a level then get the next belt so 
sensie will let you in. Don't worry the level will be the same but there 
will be some extra thigs you have to do.

Pause the game then enter this code.

  Hold R1 and press Square, Square, Square,Circle release
  R1, Hold L1 and press Triangle, Triangle, release
  L1, hold R1 and press Square, Square

  

During game press start to pause and then enter this code to get big 
  heads: Hold R1 and press Triangle, Triangle, Triangle, 
  Triangle, release R1 and HOLD L1 and press Triangle, Triangle, 
  now HOLD L1+R1 and press Triangle, Circle, Triangle

If you are having a hard time beating those minibosses, then here's your 
help. First, always press left, right, down, or up and x at the same 
time to dodge that swors throw thingy. Then after he throws his sword 
and he does not have it go in and keep pressing square. 

Don't worry, his sword cannot hurt you.

During game press start to pause and then enter this code to upgrade 
  your sword.

  Hold L1+R1 and press Circle, Square, Circle, Triangle, 
  Triangle, Square, Circle, Square


  

To unlock the Battle Arena, get all the grades, then you should get 
  the master grade. The Battle Arena will now be open in Robot Beach.