# NFT Upgrade Since there is a lucky mechanism in a limited fish pond (fund pool), players need to hold more Cannon NFTs or higher levels of Cannon NFTs if they want to earn more rewards. There are two options for obtaining Cannon NFT; either from a mystery box or synthesis. First batch of mystery box sale sales is 10,000 pieces with the unit price of 16,667 MMG tokens. 90% of MMG tokens from the sales will be burned. Different star levels of NFTs can be obtained from a mystery box; however, getting 1-star NFT has a higher probability. On the other hand, synthesizing two same star level NFTs to a higher one requires a certain amount of MMC. For example, a new 2-star NFT can be obtained from synthesizing two pieces of star-1 NFTs with 240 MMC tokens, and the synthesis success rate is 80%. After the synthesis is successful, it requires a cold down time of 6 days. Players have to wait for six cold down days before synthesizing two 2-star NFTs to a new 3-star NFT. If the synthesis fails, MMC will be deducted but the NFTs remain unchanged. ![](/files/Tav39uPZoafB9EmyzMwb) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.mmggamefi.com/nft-details/nft-upgrade.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.