The Lottery is a slot machine-like minigame in Super Smash Bros. Melee in which players use Coins to try to win a trophy. The more coins that are entered, the better the player's chances of receiving a new trophy, as opposed to one they already have. Up to 20 coins can be inserted at once. Each time a new trophy is won, the odds of getting another new trophy is lowered, which is indicated in a percent, until all trophies are won (0% of getting new trophy).
Even when the player has attained all collectible trophies, the Lottery function can still be used.