An alternative to this that also runs in the browser is the Azure Quantum katas at https://quantum.microsoft.com/en-us/experience/quantum-katas. It has an introduction to quantum computing concepts with exercises in Q# you can evaluate in the browser, as well as a quantum focused Copilot you can use with login.
(Full disclosure: I work on the team that builds the developer tools for Q#)
Hi Austin, nice to see you on here! Glad you find it useful. If you want to try out the VSCode.dev experience too, check out https://vscode.dev/quantum/playground/. Let us know what you think!
(Full disclosure: I work on the team that builds the developer tools for Q#)