# Introduction Players, by spending free gold coins which are gifted on a daily basis, can use Cannon NFT to shoot marine creatures in order to earn MMG tokens. Cannon NFT varies from 1-star to 8-star. Higher level of NFT earns more rewards. Additionally, with daily check-in rewards, players can fully cover the cost of their NFTs, not to mention additional P2E rewards. Every Cannon NFT has a life cycle. When the NFT expires, players can either synthesize it with MMC or sell it on the secondary market; this solves a deep problem in many GameFi games: inflation. The MMG team is committed to creating a long-term sustainable ecosystem that allows players to enjoy the game while being entertained and profitable at the same time. --- # 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/introduction.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.