Sudden Death (サドンデス, Sudden Death) occurs when any VS. mode match ends in a tie. A tie happens when at least two characters or teams have the same final score at the end of a Time match, the same amount of stocks at the end of a timed Stock match, the same amount of coins at the end of a Coin Battle, or the same total score at the end of a Bonus match. In an untimed Stock match, Sudden Death is possible if all remaining characters lose their last stock on the same frame.
In matches with three or more players, Sudden Death will only occur with the players who have ties that need resolving, excluding the other players.
When Sudden Death occurs, the words "Sudden Death" will appear onscreen with the announcer calling it before the "GO!" signal and the match will restart with only the players involved in the tie, all of whom are given one stock and 300% damage, making them very easy to KO in a single hit. In effect, this makes it so the first player to land a hit on their opponent(s) wins Sudden Death and therefore the match. With the exception of the original Super Smash Bros. and certain stages in various games, items will not spawn at this time even if they are turned on.
From Melee to Smash 4, if nobody wins after roughly 20 seconds, Bob-ombs begin to fall from the sky to speed up the match. Unlike the Bob-omb items, these immediately explode on contact with any surface or player. In Melee, however, the Bob-ombs act a little different than other games - they have no animation for appearing and can explode in midair without touching anything. As all players have 300% damage, getting hit by a Bob-omb is essentially an instant KO; however, with precise timing, players can grab Bob-ombs in midair with air dodges or tech on any walls. Prior to Smash 4, it is possible for a falling Bob-omb to instantly KO a player off a side blast line while the other player is currently being sent flying by a Screen or Star KO, causing the latter player to win the match in the middle of their KO animation; in Smash 4, Star and Screen KOs normally no longer occur during Sudden Death.
In Ultimate, the camera will start at a fixed position and gradually zoom in from the center of the stage from the start of Sudden Death, with the blast zone shrinking alongside it until the camera itself is zoomed in very closely. After a few seconds, Bob-ombs will drop down in the attempt to eliminate players lingering in it too long. The screen also now has flames around it from corner to corner, surrounding the center. Also, if the battle is Stamina, all players will have 1 HP.
Should a tie occur within Sudden Death itself, which can only happen if all remaining characters are KO'd on the same frame, the match will end and a random player is selected to be the winner. In the first two Super Smash Bros. games, placement is based on port priority: in the original Super Smash Bros., the winner is the player with the highest port number (whose controller is closest to P4), while in Melee, the winner is the player with the lowest port number (whose controller is closest to P1). As multiple players must be KO'd on the same frame for this to occur and the games run at 60 frames per second, the chances of this occurring are slim and any advantage given to certain player numbers compared to others is decidedly negligible, especially since Sudden Death is never used in competitive play. In Brawl, tests have shown that the winner of the match is decided at random. In SSB4, the winner is whoever dealt the most damage, with placement of the other players following suit.
In SSB4's Tourney mode, Sudden Death did not occur in Regular Tourneys, and could be disabled in player-made Tourneys as well. If a tie occured when Sudden Death was disabled, victory was awarded to the player who dealt the most damage throughout the match.
In competitive play
In tournaments, should Sudden Death occur, it is ignored, with the winner being decided by other factors. This is because of three main reasons:
As a result of being too imbalanced to be used to resolve ties, should Sudden Death occur in a tournament, the winner is declared by some other criteria. In the most common case of the clock expiring while both players are tied in remaining stocks, the player with the lower damage percentage wins. In the rare event of both players having equal stock and damage, or if both players are simultaneously KO'd (on the same frame) on their last stock, the winner is determined through a one-stock rematch with the same characters on the same stage. If both players are KO'd at the same time due to a sacrificial KO, tournaments sometimes have a rule that declares the initiator the winner, instead of holding a one-stock rematch.
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