At the bigining of the game where the logo Power stone 2 starts to appear, quickly repeated a press like Start, x,y,x,start,x,start and when you had a sigh of chirp, you doing all objects is mirror in the shop window.
At the beginning of the game where the logo Power Stone 2 starts to appear, quickly repeated press Start, X, Y, X, Y, Start, X, X, Start and when you hear a sound of a bird chirping, that means you have recieved all of the items in the shop window.