Black hole glitch
The black hole glitch is a glitch in Super Smash Bros. Melee that causes several of Peach's Vegetables to become stuck in a small area. Characters that touch the concentrated turnips will receive massive damage in seconds. The glitch was discovered by Aftermath and Juce in late 2004. There are a number of methods to perform the glitch, all of which involve Peach throwing several Vegetables into a stream of Super Scope shots. The glitch does not work in Brawl and Smash 4 for several reasons, the main reason being the inability to perform the Infinite Super Scope glitch.
Performing the glitch
This method is the most well-known and first one reported. It requires 4 human players.
Any stage where two characters can face each other horizontally far apart while a third stands below them can be used. Examples include:
*These stages are not recommended, as the glitch only works when certain platforms are out.
This method is best when 4 human players are not available, and can be performed with as few as 2 players.
Any flat, unmoving stage whose length is longer than the range of a Super Scope shot. Final Destination is recommended.
After the black hole has been constructed, various modifications can be made. Beware that too many of these may cause a lot of lag or cause the game to freeze.
The most well-known modification is commonly named the "Ultranova". To perform this, have the fourth character in Method #1 above be Ness, and perform PK Fire into the black hole, surrounding it with flames.
A weaker variant of the "Ultranova" that also involves Ness's PK Fire, the "Supernova" can be performed by first KO'ing one Fox/Falco so that he gains temporary invincibility from the revival platform. While invincible, Fox/Falco should enter the black hole and use Reflector, which will cause him to get stuck. Ness should then use PK Fire ~15 times into the black hole. Finally, have Peach remove her Vegetables from the black hole (by air-grabbing them with Z). This should leave the PK Fires alone stuck together.
Removing the black hole
To remove the black hole, simply have Peach air-grab the Vegetables from inside. Once the number of Vegetables has dropped to ~13 or fewer, the black hole will fall apart by itself. This can also be done by any other character unaffected by the Vegetables (such as a character on the same team as Peach with Friendly Fire off, or a temporarily invincible character).