I was just reading the email you sent today with the last-minute checklist. Regarding the Adventuron plug, I don't mind giving a plug, but I don't like linking to a web page that may be here today, gone tomorrow. Knowing how rapidly Adventuron stuff changes, is that page guaranteed to be there for the forseeable future?

Also, I was thinking of adding it to the congratulations page at the end of the game, as that feels like the place where it would have the most impact and would most likely be followed. Would that be okay?

An in-game plug is not necessary, and the plug is absolutely optional.

But, if you want to put it inside the game, use the general URL https://adventuron.io , that will always be there (as long as I draw breath). Outside the game, linking to the tutorial is better, and I have no plans to change the documentation URLs (as I'm linking to them from all over the internet(.