Super Sudden Death
Super Sudden Death or 300% is a Special Melee mode in Super Smash Bros. Melee and a Special Brawl option in Super Smash Bros. Brawl, respectively. They challenge two to four players to a match where each player's damage percentage is automatically set to 300% each stock. This is much like the Sudden Death mode which occurs after a tie in standard Vs. Mode with the only difference from being that this mode lacks the falling Bob-ombs that fall on the opponents after a certain duration of time.
Super Sudden Death radically changes the way the game is played as virtually any attack with knockback scaling can KO the opponent. As such, this mode tends to greatly favor extremely fast characters such as Sonic and characters with powerful projectiles such as Samus. Even Pit's arrows can cause significant knockback in this mode. Conversely, slow, powerful characters such as Ike are at the greatest disadvantage because the advantage they gain through greater knockback from attacks is negated by all attacks having extreme knockback.
Lucario tends to have a greater advantage in Super Sudden Death mode as its aura-based attacks become more powerful as it takes damage, capping at 170%. With Lucario always at 300% damage, this property retains its maximum level throughout the match unless Lucario consumes large amounts of healing items.
In Melee, the songs on Mushroom Kingdom and Kingdom II are changed to Mushroom Kingdom (Finale) and Mushroom Kingdom II (Finale), respectively, during this mode (if one does not play the Dr. Mario alternate music), as they are in the regular Sudden Death.
In Brawl, this mode is also used in Co-Op Event 3: Fastest, Shortest, Sudden Death, but it only lasts for ten seconds.