> For the complete documentation index, see [llms.txt](https://zypher-network.gitbook.io/zypher-network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine.md).

# Secret Engine

- [What's Secret Engine](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine/whats-secret-engine.md): A zero Knowledge Secret Engine.
- [Shuffle](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine/shuffle.md): A zk-powered shuffle for cards
- [Matchmaking](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine/matchmaking.md): A zk-powered matchmaking
- [SDK - Shuffle](https://zypher-network.gitbook.io/zypher-network/developer-support/ai-game-demo/zk-sdks/secret-engine/sdk-shuffle.md): Hide card information and ensure card security.