The following Super Paper Mario game cheat codes and unlockables are for Wii platform. Well the Super Paper Mario is just for Wii anyway. It was developed by Intelligent Systems and published by Nintendo.

Super Paper Mario Game Cheat Codes and Unlockables:

Barry – Provides a force field that serves as protection and at the same time a weapon against enemies.
You will need to defeat Francis in chapter 3-4. After that, go to chapter 3-1 and look for Barry behind a bush.

Piccolo – Makes melodies that can cure some status problems and can trigger in-game events.
In order to obtain Piccolo, you will need to do several things. First, place the 6th pure heart, then talk to Merlee and help her, then talk to Merluvlee, then to Bestovious, then to Watchill, then to Merlumina, then to Merluvlee again in order to get the Random House key. Phew!

Infinite 3-D Mode with Mario
In order to unlock Mario’s card that will give you unlimited 3-D mode, you will need to beat Flopside’s Pit of 100 trials twice.

How to Gain Easy Experience
You have to accomplish chapter 5 then go back to 5-4. Jump on the block next to the pipe where sapiens keep coming out of then use the bowser’s flame to kill the sapiens. Continue killing the sapiens to gain as much experience as you wish.

Hammer Whacker
In order to unlock the hammer whacker, get the gold card found in the treasure chest located in the back room of The Overthere in Flopside.