If you can't beat it without gold, or if you have enough energy to play, just dig the blue ore (Picture 3). It is a material for upgrading blood and attack power. One for level 1, and two for level 2, stacked on top of each other. Look at drawing cards. Hero upgrades also draw cards. If you see 0/5, it means that you need 5 cards to upgrade to a level, and cards can only be drawn. The first time you use gold coins, the second time, and the third time you use krypton gold diamonds. Draw, look at the explosion rate. It is also a secret change. The first time you draw gold coins, it must be a junk card.