With eXtra Keno you have just that opportunity. While playing eXtra Keno you can earn eXtra balls for each 'paying' number that comes up. You can also purchase eXtra balls via In-App Purchase. With the 1.2 update that just got approved today, you now get more for your money!
Previously, you got 100 eXtra Balls for $.99, now you get 250! Before for $1.99 you got 300, now you get 1,000. Also, now instead of 1,000 eXtra balls for $4.99 you now get 5,000 eXtra Balls.
How to earn eXtra Balls: When you're playing eXtra Keno, you earn an eXtra Ball when a number that you marked is hit, and it earns you a payout, or a higher payout. So, for example, if you're playing a four spot, you would get an eXtra ball for getting two hit, another eXtra ball for hitting 3 out of 4, and so on. SO you can earn more eXtra balls the higher spots you play and hit.
How to use your eXtra Balls: You can use eXtra balls on any winning game. To do so, you simply tap the RED eXtra Balls button, and then choose 5, 10, or 20 eXtra balls. When you do this, 5, 10, or 20 eXtra balls will be drawn and help to increase your chance of winning. Say you only have 13 eXtra balls that you've earned or purchased, and you've hit 8 out of 9 and you really want to use 20 eXtra balls. Keep reading to learn how to buy eXtra Balls.
How to buy eXtra Balls: When ever you could use eXtra Balls, you can also choose to buy them. When the RED eXtra Balls button comes up, you can tap on it, and then choose "Buy eXtra Balls." This will give you the opportunity to purchase eXtra balls through In-app purchase.