Boxies can be upgraded up to legendary rank by tapping them. The higher the rarity, the better the rewards.
Common Boxie upgrade chances (after 4 upgrade taps):
| Rarity | Probability |
| COMMON | 58% |
| RARE | 32% |
| EPIC | 9% |
| LEGENDARY | 1% |
EPIC Boxie upgrade chances (after 4 upgrade taps):
| Rarity | Probability |
| EPIC | 83% |
| LEGENDARY | 17% |