Hey @dev.virgil, welcome to the Auth0 Community!
After checking with one of our senior engineers I have been able to confirm there isn’t a a solution out of the box for what exactly what you are looking to do. It’s important to note that the SDKs are intended to make implementing authentication much easier.
From what I gather in your use case, leveraging the Universal Login to auth your players may not be ideal. However if you build a login page you should be able to make API calls to the Auth0 API to help authenticate your users and keep that in game experience. Here is some guidance on custom login UIs.
I also recommend checking out our latest blog post pertaining to gaming.
If you decide to build out this custom path, please let us know if you have any questions on the authentication call front.