To unlock characters a different way, you must must play a certain number of Vs. matches.
To see several Japanese versions of the Nintendo systems in the trophy room, as well as a bonus Virtual Boy, switch the language on the game to Japanese.
After unlocking the Sound Test (portions of this trick can be done before unlocking the Sound Test, however), you can change the music that plays on some of the stages. When selecting them, hold L or R until the stage loads. Each human player competing in the match must also hold L or R. The stage's music will change. This trick works on the following stages:
- Infinite Glacier: Icicle Mountain (Retro theme from Balloon Fight for NES)
- Termina: Great Bay (The theme of Lost Woods from Legend of Zelda: Ocarina of Time for N64)
- Hyrule: Temple (A remix of various themes from Fire Emblem titles)
- Yoshi's Island: Yoshi's Island (Stage 1-1 and world 1 map remix from Super Mario Bros. 3 for NES)
- Kanto: Pokémon Stadium (The Trainer Battle theme from Pokémon Gold & Silver for GBC)
- F-Zero Grand Prix: Big Blue (A theme from Mach Rider for NES)
- Eagle Land: Onett (The theme of EarthBound)
- Mushroom Kingdom OR Mushroom Kingdom II (The Fever theme from Dr. Mario)
- Special Stages: Battlefield (The theme used in Multi-Man Melee fights)
- Special Stages: Final Destination (The theme used in Event 51, The Showdown)
Sometimes, the music will change automatically (12% chance).
Normally, the trick in which you hold down A button while a stage is loading so you turn Zelda into Shiek doesn't work in Event Matches. There's an easy way around this, which is pausing the game after the Event Match has begun, holding A button down, and pressing Z (don't stop holding it down.) If done correctly, this'll reset the Match with you as Shiek. If you reset again, you'll turn back to Zelda unless you do the trick again.
If you put the language to Japenese and go into the homerun contest, you will see that the platform is smaller than the platform with any other language.