The idea is as you play your favourite games at Duelz Casino, you're competing against another player in a duel. Treasure Chests can be bought using either your balance or stars earned from winning duels, which contain Spells such as Rage, Revenge, Dragonfire, Healing, Absorb, Strength, Shield and others, that you can use to gain an advantage. Whoever has the highest HP at the end of the duel is the winner.