Item upgrading is a new game play. Upgrade your skin to a higher value skin. The probability of success depends only on the value of the items you choose. For example, choose the accessories of your $100 in stock for preparing decorations, choose $150 accessories in the website as the target accessories, the probability of upgrading is 63.33%. You can choose the drop interval below 63.33 (0 - 63.33) or higher than 36.67 (36.67 - 100). Click upgrades, at which time the system encrypts a random number (0-100), which if the random number is upgraded within the range of your choice, the upgrade fails.