. The range of numbers displayed on its cards differs according to the region it is played at. The conventional mode of the game allows a win so long as the numbers called form the infamous pattern in a horizontal, vertical or diagonal configuration. In order to produce a more challenging game, all numbers on the card need to be blacked out or covered to achieve victory. This version is normally practiced in games with a higher payout such as jackpots. By stretching the game's duration, it certainly adds more excitement to the event. Ultimately, this form of online gaming is no different from others as it is taking a chance on the unknown, more commonly known as gambling.