saving money for better items

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Wow 2m...
How dit you save that much gold any tips that you can give me?
watching many advertisements , always playing , selling items and throwing to end energy
The game Should sell the stones to level up the pet more easy
I know
I did the same thing, save money for upgrade my lighting sword but need more stone,. Dont forget to keep 500k for upgrade pet to lvl 29
They offer it after win battle abt 50soul for 10 stone maybe,. I forgot