> ## Advanced mode

> Fetch the complete documentation index at: https://antithesis.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

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When you navigate to the advanced mode, you'll see the Antithesis Notebook.

From this notebook you'll have access to a live reproduction of the bug you're investigating. You can run commands on your system, undo those commands, rewind and fast-forward time, and branch the multiverse to your heart's content.

To use the advanced mode, you'll need to understand some core concepts about the multiverse and how to use the Antithesis Notebook.

If you prefer to start with the concepts, check out [Exploring the multiverse](/docs/product/debugging/advanced_multiverse_debugging/moment_branch/).
If you prefer to learn by example, check out our [Cookbook](/docs/product/debugging/advanced_multiverse_debugging/cookbook/) or the in-product help() function.