It's very easy! Select an item from your inventory (left) and an item you like from the website's inventory (right), then click the 'UPGRADE' button. If you don't have any items in your inventory, you can upgrade them using Balance or Mana.

The probability of a successful upgrade is determined by the price ratio of the items. The chance is displayed in the game circle. The lower the price of the item in the website's inventory, the higher the chance of success!

Yes! You can upgrade not only with items obtained on the website, but also using balance or mana.

This can happen for various reasons, but it's really just a visual glitch. The animation you see only illustrates the result, while the success of the upgrade is determined immediately after pressing the button.