# Bridge ### Multichain CryptoKnights is a multichain game, meaning that the in-game assets can be **imported from and withdrawn to multiple blockchains**. ### RUBY as a Cross-Chain Token For our RUBY token to exist on multiple chains, we incorporated a **special type of ERC20 contract that can be aware of its balance on other chains**, so that the total amount of RUBY on all chains it has been deployed on remains constant. ### NFT Bridging The NFTs in CryptoKnights will first be auctioned on a single blockchain, then can be imported into the game and withdrawn onto other chains. ### The Game is a Bridge Therefore the game serves as a bridge for all those tokens. --- # 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://whitepaper.cryptoknights.games/technical/bridge.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.