Super Mario RPG: Legend of the Seven Stars Cheats

Sometimes in the Forest Maze, you'll battle some enemies that look similar to a character from another game. The enemy looks like Donkey Kong! If you use Mallow's "Psychopath" , it should say "Don't confuse with someone else!".

Link Catching Some Z's
Sleep at the Inn at Rose Town. When Mario wakes up, Link is there sleeping! He doesn't talk to you, but if you try, the game plays a familiar Zelda sound.

Samus Catching Some Z's
Check out the Guest Room in the Mushroom Kingdom Castle after getting the 5th Star (She only appears at this time. If you try to progress too much further in the game, she'll be gone)

Credit goes to: http://www.rpgclassics.com/shrines/snes/smrpg/secrets.shtml

Im Booster Tower, you'll eventually come to a room with stairs going up, and two curtains to the left, connected to the wall and a pillar. Go through one of the curtains, come out the other sidee, and you'll have the original Mario look as well as a change of music.