You can only collect them through promotions and win more by using them to play promotional games.
However, unlike with Gold Coins, you cannot purchase extra Sweepstakes Coins. Sweepstakes Coins, on the other hand, can be used to redeem real money prizes if you win enough and become eligible. So, what’s the difference between Gold Coins and Sweepstakes Coins? Well, Gold Coins are just the standard virtual social casino coins that you can use to play the various slots and table games on offer in the Chumba Social Casino. T&Cs apply, 18+ Gold Coins vs Sweepstakes Coins