The online casino games with the biggest payouts are progressive jackpot slots. If you hit the jackpot on one of these slots, you can win several million in rock hard cash in some games.
If you prefer to play a casino game where you win less, but win more often, it's worth trying out classic table games. That's because the house edge in these games is very low. Blackjack, for example, has a house edge of only 0,28%; while online slots generally have a house edge of 2-10%.