-Big Head Mode-
Hold R button, Y,Y,Y,Y, Release R button, Hold L button Y,Y, hold R button + L button, Y,X,Y

-Complete Current Mission-
Hold R and press B,B,B,X, release R and hold L and press Y,Y, release L the hold R and press B,B

-Sword Upgrade-
Hold L+R and press X,B,X,Y,Y,B,X,B

During a mission, pause the game and enter this code: Hold R and press B,B,B,X ,release R hold L and press Y,Y, release L then hold R and press B.B. Note that it only works on normal missions and not on "Collect the Red Coins" or "Find all Enemies" Missions.

During a mission, pause the game and enter this code: Hold R button, Y, Y, Y, Y, Release R button, Hold L button, Y, Y, Hold R button + L button, Y, X, Y.

During a mission, pause the game and enter this code: Hold L + R and press X, B, X, Y, Y, B, X, B.

To unlock Battle Arena get all normal grades, then get the master grade. The Arena will then be opened in Robot Beach.