Coin is a mode of Vs. Play in Super Smash Bros. Melee and Super Smash Bros. Brawl. The objective is to collect as many Smash Coins - and, in Brawl, Smash Bills - as possible. Coin Battles are timed, and the player holding the most Smash Coins at the end of the match wins.
Coins are produced when any attack hits an opponent. The amount and value of the coins released depends on the strength of the attack. Smash coins thrown from a player will not be deducted from their tally, but being KO'd will cause the player to lose half their coins (to a maximum of 100 in Brawl). These may be grabbed if close enough to the stage. Often, it is a bad strategy to use projectile moves like Bowser's Fire Breath for long periods of time, because the person getting hit with it will rack up points by collecting the coins knocked out of them. On custom stages, one can bounce between spikes and a low platform to rack up coins quickly.
In Melee, there are gold, silver, and copper Smash Coins, worth ten, five, and one point respectively. In Brawl, the coins were lowered in value to six, three, and one point respectively, while a new item, the Smash Bill, is introduced. Bills flutter and fly erratically, making them difficult to pick up, but they are worth 10 points each.
Should multiple winning players have an equal amount of coins when time runs out, they will participate in Sudden Death. Coin tallies in Sudden Death do not count - only whoever wins the Sudden Death counts.
 See also