Event 18: Link's Adventure
Link's Adventure (リンクの冒険, Link's Adventure) is the 18th event match of the 51 event matches in Super Smash Bros. Melee. This event takes place as a two-stock match between Link and Dark Link; Dark Link is given a completely black sub-color and he lacks any voice samples, but otherwise, he behaves identically to Link. His character icon is dark, indicating he is an all-black character.
A similar event with the same number appears in Brawl under the name Dark Link Duel. However, rather than using the standard percentage-based damage meter, that battle is fought in Stamina mode. Doppelgänger Duel in Smash 4 is also a similar event to Dark Link Duel except that it consists of Pit and Dark Pit and the player plays the Dark character instead.
The entirety of the Event Match acts as a reference to the video game Zelda II: The Adventure of Link. The Japanese name of the match is the same as the Japanese name of the game. Link's red palette swap in the match references the shield spell Link could cast before the climatic fight to reduce damage taken; in the game, it would make his tunic turn red. The match takes place in the Temple stage; the background music of the stage is a remix of the Temple theme from Zelda II.
The description of the Event Match states that Link "has two" dark sides; the significance of this is of debate. Some claim it acts as a reference to the fact that Dark Link's first appearance was in the second Zelda game, though others claim it references that Dark Link made a second appearance in the Zelda series with The Legend of Zelda: Ocarina of Time. However, it could merely be a reference to the fact that Dark Link has two stocks and must therefore be defeated twice.