I have played this game before, but here the rules are different. Why is that?

Some of the most famous games like craps or blackjack have many variations, and the online casinos will often offer some or only one of them in their efforts to ensure customer satisfaction. Be sure to check the game rules before you sit down at a table and wager! Remember that once a bet is placed you can’t undo it. Ultimately, you are responsible to know the rules of the games you are placing bets at.