Gold (known as Coins in earlier installments) is a type of currency used within Melee, Brawl, Smash 4, and Ultimate for use in various features of the game. Initially having limited uses, later games in the series added several new gameplay modes where it can be used.
Coins debuted in Melee, where they were rewarded after all versus matches and successful single player modes, with longer matches or better performances leading to more coins. The primary point of interest for Coins was for Melee's new trophy collecting aspect, where Coins could be used to potentially win new trophies in the game's Lottery mode. In addition, the game's Classic, Adventure, and All-Star modes all required varying quantities of Coins for the player to Continue. The player could own up to 999 coins at once.
Brawl expanded on the Coins' functionality by allowing them to have an effect on gameplay in the game's various online modes; selecting a stage in the mode would cost the player one coin, though selecting Random would not cost anything. Coins could also be used in the game's Spectator mode, with players potentially gambling coins for various awards. Outside of this, Coins reprise their role in the single-player games, though the Coin Launcher mini-game supplanted Melee's Lottery. As to make light of their increased number of uses, Coins could also be won in the game's Character Roll Call, and the number of coins the player could have at once was increased to 9,999.
Now renamed to Gold (usually abbreviated to “G” in-game), the currency returned in both versions of Smash 4, and its uses are again expanded. It is earned and spent in higher quantities than in previous games, with a cap of 999,999,999.
Gold is used to adjust the difficulty of Classic Mode, to buy play time in Trophy Rush, to play Special Orders, and to purchase trophies from the Trophy Shop. As an additional incentive to collect Gold, one of the Challenges in Super Smash Bros. for Wii U requires the player to amass 300,000 G. Outside of gambling in Spectator mode, Gold no longer has any use in online play.
Like trophies and custom parts, Gold is commonly obtained as a reward in various solo modes, and for completing certain challenges. Equipment can also be sold for Gold, and Gold is once again obtainable by simply playing versus matches, though not when playing With Anyone.
The Gold (Classic) /Smash Coins trophy is exclusive to Super Smash Bros. for Nintendo 3DS.
Just like in Smash 4, Gold is obtained as a reward in solo modes and completing challenges. Small amounts are also awarded for every fight in Smash mode. Gold is used to continue in Classic Mode and purchase items in the shop.