Q:

Can I ask self-answered questions about obscure games?

I play an obscure game that has very little Web presence. Over the years, the group that I play with has struggled through many questions about rules, implementation, DMing, etc. for this game. 
Can I ask and self-answer some of the questions we've dealt with, in the hope of sparing possible future players the baleful journey of discovery that my group has endured?

A:

Yes, you may do that. This is in fact exactly the kind of scenario for which self-answered questions exist: describe a problem you've experienced and ask how to resolve it, then provide the solution you used.
Thank you for thinking to share what you've learned with others, I appreciate it.

If you have financial/business ties with the game, please remember to follow our aptly-named advertising policy: How to not be a spammer. This includes disclosing your affiliation. Financial/business ties means you work for/with the producer, you stand to gain financially from sales, etc — having bought the product or being a kickstarter backer is not necessarily an affiliation.

A:

Can and should. The stack welcomes this kind of FAQ behaviour by design.
Stack Exchange is a network of sites with one goal in mind: To build a knowledge base on each particular subject.

Can I answer my own question?
Yes! Stack Exchange has always explicitly encouraged users to answer their own questions. (...)

And from Jeff Atwood himself:

It’s OK to Ask and Answer Your Own Questions
To be crystal clear, it is not merely OK to ask and answer your own question, it is explicitly encouraged.

A search on the subject of self-answering can lead to more opinions on the network. Here are some:
Is a short description of a question OK if self-answering?
Self-answering questions without other answers
Can you answer your own questions on Stack Overflow?

