Smash Brothers

Borrow a Life
By: ANTDocEvil via GameSages, [Via N64CC]

When playing a team multiplayer match, if you are defeated, but your team mate still has 1 or more life in stock. You can use one of his life to get back in the action by pressing A+B+Z+Start. Be sure to ask for permission from your friend.

Get Mew in your Pokeballs
By: Team IGN via GameSages, [Via N64CC]

After you get all 4 secret characters, (Luigi, Ness, Captain Falcon and Purin) you can find Mew in your Pokeballs! It takes a little bit of time, but you'll see one. If you have the Secret Item Menu, set it to all Pokeballs and it will be easier, or go to training mode. Mew has no apparent effect on the battle.

Kirby's Power Loss
By: Cranky's Island via GameSages, [Via N64CC]

Everybody knows that Kirby can swallow his opponents and take on some of their powers in this game, but what if you accidentally "ate" a character you didn't want -- and you want to pursue someone else? Simple: Just press the L Button to pull of Kirby's "Hello!" taunt and he will discard whatever power he took on.

Custom Menu
By: Team IGN [Via N64CC]

We're not sure how we got this one -- but here's the deal. After countless Yoshi vs. Kirby battles in the multiplayer mode, a custom menu was unlocked that enables you to set all the multiplayer options you would wish for. You can determine which items will show up in the battles, and which won't. While we're not sure what triggered the secret menu to appear, it seems like it's a "time release" feature that pops up once you have completed a certain number of battles.

Sound Menu
By: I. T. Works via GameSages

Beat Bonus Stages one and two with all 12 characters. You need to have unlocked the four secret characters first. Now go into the Data section.

Classic Mushroom Kingdom
By: Cranky Harris via GameSages [Via N64CC]

To access the hidden classic Mario stage (complete with POW signs, Piranha plants, warp tubes and elevator), beat the game's one-player mode with each character. At the end, the game will tell you that you can now access Classic Mushroom Kingdom in the versus mode.

Change Outfits
By: That Octopus via GameSages [Via N64CC]

You can change your character's outfits by tapping the four C Buttons at the character select screen. Some costume changes are limited to colors, but characters like Pikachu are also available with a hat.

Secret Characters
By: Yoga and Jason Ballard [Via N64CC]

Ness - To play as Ness (from Mother 2, EarthBound), beat the game on Normal difficulty without continuing. This trick won't work if you change your number of lives. It has to be set to 3! After you have beaten the final boss, wait for the credits to finish rolling -- then fight Ness. Once you beat him, he will become available on the character selection screen.

Luigi - To play as Luigi, pass the Bonus Practice 1 for at least 8 main characters and Luigi will challenge you. Defeat him and he's yours.

Captain Falcon - To play as Captain Falcon, simply beat the game as one of the regular characters. When Captain challenges you, defeat him and he will be a playable character.

Purin - To play as Purin, play a game as Captain Falcon. After you beat the game Purin will challenge you. Defeat her and you will receive the second Hidden Character.