Sudden Death is a special event unique to the Group mode of Super Smash Flash 2. It occurs in time matches and timed stock matches when the time runs out and there is a tie in or stocks between the characters. It may also occur in stock matches when two or more characters lose their final stock simultaneously. The tied opponents fight with 300% damage and one stock each, and the last one alive is the winner of the match. After about 50 seconds, Bob-ombs start to drop on the stage to KO the players. Sudden Death is also a recurring event present in all the official Super Smash Bros. games. Despite this, it was not present in the original Super Smash Flash. The high 300% damage makes each player vulnerable to smash attacks, grabs and special moves.
An early design of the "Sudden Death" screen in Super Smash Flash 2.