To upgrade your heroes, you can collect cards by winning levels, and you can also check out the Knight Offer!

Here’s what you need:

Cards: Earn cards by winning levels. You’ll need 3 cards to unlock each hero.

Potions: Collect potions as you play. Once you have enough cards, use the potions to upgrade and strengthen your hero.

Upgrading makes your heroes much stronger and even more helpful. Keep playing and enjoy seeing your heroes power up!