# 3rd-party contract development If you're interested in Ethereum smart contract development and Hardhat tooling we release all [smart contract source code and scripts](https://github.com/darkforest-eth/eth) used in developing and maintaining the game But thats not all. With that knowledge you should be able to write contracts that interact with the mainnet Dark Forest universe, no permission needed. See the [Sophon Reveal Marketplace](https://github.com/projectsophon/df-play-to-earn) example for a contract that lets users sell their daily reveal to the first bidder. --- # 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://dev-guides.zkga.me/developer-resources/3rd-party-contract-development.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.