Increasing numbers of online casino players are choosing to play blackjack when they sign into their Internet casino. Blackjack is a popular casino challenge because it encourages players to develop a high level of skill in the game, though many players simply enjoy the relaxing atmosphere and environment of lucky wins. Each alternate version of online blackjack emphasizes a different aspect of the game. Some blackjack variations encourage players to test their luck while others encourage strategy and decision-making. Blackjack variations include Hi-Lo-13 Blackjack in which players place side bets on whether the first two cards that are dealt will add up to more than 13, less than 13 or exactly 13, Bonus Blackjack in which gamers earn bonus payouts for specific card combinations and Triple 7s Blackjack where players earn bonus wins for one, two or three 7s as well as a progressive jackpot for 3 diamond 7s.