Mario & Luigi: Superstar Saga Cheats

Go to the summet on HooHoo Mountain, walk to the top right of the summet until you get to the edge. There should be a slant in the summet shape (like an octogon) and two stone sharp-like rocks, walk up to the top one and look underneath the B button icon, you should see Princess Peach's Castle from Super Mario 64.

In the lobby of the Yoshi theater, there are four posters on the wall referring to Nintendo video games:

1. Kirby Story--referring to the Kirby series
2. Wario poster--referring to the Japanese box art design for "WarioWare, Inc.: Mega Microgames"
3. M&L--referring, of course, to this game (more specifically to the game's originally intended title, "Mario & Luigi")
4. Legend of Stafy--referring to a Japan-only game series of the same name