Please note that there many codes and secrets in Super Smash Bros Melee. This section contains codes and secrets only as they relate to things in EarthBound.

Unlock Fourside Arena
In order to unlock Fourside you need to do a rather simple task. All you need to do is play 100 verus matches. You must finish the fight also. You cannot just start, then quit the match. Once you complete 100 verus matches, select Fourside on the map select screen (it is beneath Onett.)

Get EarthBounds Trophies
There is no clear way of getting these. They can be found/won at random in the following locations: Trophy Slot Machine, Collect Trophies miny game, find it in Adventure mode, get it after a certian number of verus matches. So far these are the known EB Throphies: Ness (3 kinds), Poo, Starman, Onett, Fourside, Jeff, Paula, Mr. Saturn, UFO.