The best online casino game to win money is blackjack, also known as 21, due to its low house edge and strategic gameplay. With proper strategy and skill, players have a higher chance of winning real money in blackjack compared to other casino games. Additionally, blackjack offers various betting options and side bets, enhancing the excitement and potential payouts. Many online casinos provide live dealer blackjack games, creating a more immersive and authentic gaming experience. Overall, choosing blackjack as your go-to online casino game can increase your chances of winning money and enjoying a thrilling gambling session.