The best scratchcards offer high odds, high RTP, and low house advantage.Įach scratchcard offers only a few prizes. House edge refers to the advantage the casino enjoys over the player. Return to player (RTP) is a percentage that represents the bet amount that online casinos return to players as winnings. Odds refer to your chances of winning a scratchcard. What are your chances of winning the jackpot when you play scratch cards online? The software provider determines your odds of winning the jackpot right at the time of developing the scratchcard.