Event 51: The Showdown - SmashWiki, the Super Smash Bros. wiki

The Showdown is the 51st and final event match of the 51 event matches in Super Smash Bros. Melee, unlocked upon clearing the previous 50 events, as well as clearing Classic Mode and Adventure Mode at least once. The player controls a fighter of their choice

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Mew2King - Liquipedia Smash Wiki

Super Smash Bros. Melee Event 51: The Showdown (Bowser)

Super Smash Bros. Melee: Event Match #51 (The Showdown)

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Ghost on X: Melee's Event 51 Remastered in Super Smash Bros