LocoRoco

First of all go into any game you have or start a new game. then go into options and pick "play demo's" and pick the demo on the right find as many of the flies as you can. Repeat as many times as desired.

From the World Map, select a level so you are on the "Start? Yes / No" message. Hold L & R and input the following codes:

Password - Effect

STARSLOCOROCO - Gives you 10,000 coins
ALLCOLORSLOCOROCO - Gives you all the Muimui
SLACRLOCOROCO - Open all stages