Collector's Case and Upgrade Cases

Both of these cases are available in the Shop.

Collector's Case

This case contains only a few ball cards, but it has a 100% chance to unlock a new ball.  Premium and rank balls can not be unlocked via this case.

If you've collected all balls, your next step should be upgrading them. To do that you need ball cards, and you can get a lot of those by purchasing Upgrade Cases.

Upgrade Cases

These cases contain numerous ball cards, and they will help you upgrade your balls. The number of cards in each case depends on your highest available Alley. You can't get new Balls from these cases. Exception: if you have no Rare or Epic Balls in your collection, opening an Upgrade case might give you new Balls of these rarities. There are 3 tiers of Upgrade Cases:
Tier 1: Bowler Case	Tier 2: Master Case	Tier 3: King Case
The higher the tier of an Upgrade Case, the more cards will be in it! You can also get a bundle at a lower price.