Where can I post a Winter Bash test question?

Question

I want to post a test question to either:

• Gain a Winter Bash hat, or
• Test a theory about the criteria for awarding a secret hat.

Where can I post such a test question?

Answer 1

According to Is there a sandbox to post test questions? you can use the Formatting Sandbox.

Unfortunately the Formatting Sandbox only allows new answers to be posted not questions.

However, one of the up-voted answers to Is there a sandbox to post test questions? suggests that test questions are allowed as long as they are deleted as soon as possible.