15-Minute Smash
15-Minute Melee is a Multi-Man Melee mode in which the player must defeat as many Fighting Wire Frames as possible within 15 minutes without falling or self-destructing. This is argubly one of the more difficult Multi-Man Melees, though simple strategies such as spamming a single move or evading the wireframes throughout the time period will suffice.
Defeating this mode will unlock Kongo Jungle N64, an original SSB stage brought over to SSBM.
Strategies
Donkey Kong
Go anywhere on the battlefield and constantly use the Down B move. Keep in mind that Bob-ombs and Explosives could appear, so if you see an item spawn, beware of the chance that it may lead to an early death.
Mario, Luigi, and Dr. Mario
Spam the Mario Tornado, Dr. Tornado or Luigi Cyclone back and forth on the arena.
Mewtwo
Stand on the edge of a main platform and press B to start the Shadow Ball, and leave it there so any wireframes touching it will be damaged. If you get damaged yourself, throw the fully-charged Shadow Ball, and go back to the edge to start again.
Kirby
Stand right at the edge of the main platform, face inwards, and use Final Cutter nonstop. If the need arises, roll to the other side to avoid a Bob-omb or similar hazard.
Fox and Falco
Similar to the Mario Bros. method, spam the Fox Illusion or Falco Phantasm back and forth across the main platform.