This is the thirtieth installment of the Fortnightly Topic Challenge described here, with topics suggested and voted on here. This fortnight's topic is metapuzzles (suggested by paramesis), and will span from the the 11th of April to the 3rd of May. During this period, we will compile the list of questions with this tag and post it as an answer to this question.
Please note: this topic challenge has been extended one week. Its prior deadline was the 25th of April.
In the meantime, please go and propose and vote on future challenges!
Everyone have fun, and happy puzzling!
Link to other Fortnightly Topic Challenges.