As I noted in this HN post, I did not invent this system (there are other tutorials online). I'll update the web app itself to state this clearly. The goal of

As I noted in this HN post, I did not invent this system (there are other tutorials online). I'll update the web app itself to state this clearly. The goal of the web app is more about the practice modes and daily game, people are free to use Doomsday for these if they like.