Rare Coin
Rare coins are an in game currency used to partake in the Rare Machines, on File Island located in the Gamblers Casino.
There are two types of Rare Coins that are available to players at any given time.
Rare Coin
Which is tradable and obtained via a few methods.
Rare Coin Event
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Which is Character Bound and is available via methods such as, The Colosseum, Various Events, or it's located in the Xros War Raid maps known as Green Zone, Green Zone Advanced, and Miso Village. The type of coin determines which machines you're able to use, and the prizes contained within them.
The Rare Coin has a better assortment of prizes and all of them are tradable.
While the Rare Coin Event, has a much more select assortment of prizes and only a few of the jackpot prizes are tradable.