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Upgrade sword
Press Start to pause game play, then hold L1 + R1 and press Circle, Square, Circle, Triangle x2, Square, Circle, Square.
Repeat this code three, four, or five times to get Soul Sword.
Submitted by: Balendin

Unlock Battle Arena
To Unlock Battle Arena, earn all the Grades, Then you should get the Master Grade. The Battle Arena Will be open at Robot Beach.

Level skip
Press Start to pause game play, then hold R1 and press Square x3, Circle. Release R1, then hold L1 and press Triangle x2. Release L1, then hold and press R1, Square x2.
Submitted by: Balendin

Big head mode
Press Start to pause game play, then hold R1 and press Triangle x4. Release R1, then hold L1 and press Trianglex2. Hold R1 + L1, then press Triangle, Circle, Triangle

Mow grass
Where there are grass, flowers, mushrooms, other foliage, objects other than crates and barrels, and certain decorative objects, you can cut them down to earn a few extra points towards your main score. This is useful in the certain levels that require a high score to earn the grade.
Submitted by: Balendin

xPower-Ups
Whenever you kill an enemy in a rapid succession, the number to the right of the health bar increases by one up to 10. This represents what points you receive for killing an enemy, multiplied by the number displayed. This is useful in certain missions where a high score is required to earn the grade.

Healing
If you are low on health, try to find some weeds and chop them down. Notice that your Rage Ability switch will gradually increase. Keep chopping down weeds and you will soon be able to use your "Ninja Revive" to heal yourself.