This is the seventh installment of the Fortnightly Topic Challenges Rerun described here and the forty-first installment of the FTCs overall, with topics suggested and voted on here. This fortnight's topic is "Short and Sweet" (suggested by Bass) and will span from the 12th of November to the 25th of November. During this period, we will compile the list of relevant questions and post it as an answer to this question.
In the meantime, please go and propose and vote on future challenges!
Everyone have fun, and happy puzzling!
Link to other Fortnightly Topic Challenges.
The Short and Sweet topic challenge does not have a single specific tag associated. Due to the nature of this challenge, please add your own questions to the list below. The suggestion is copied to this post for posterity.
Distill the essence of puzzling into its purest form: a satisfying puzzle that will take no more than five minutes to solve.
You are free to choose any tag combination you like, but you should make the puzzle short, sweet and succinct, so that it can be enjoyed alongside a cup of morning coffee, and it won't make you miss the bus to work.
The main challenge is, of course, keeping the solution interesting and rewarding, while minimising all unnecessary complexity, ornamentation, and sidetracks.
The usual problems, like keeping the answer unique, and not making the puzzle too easy, will also become more pronounced when there's less material to work with. Yet, I'm confident that the Puzzling SE crew can overcome all these obstacles, and make some excellent, high-octane, 5-minute puzzles.
So let's try and get an "Oh, wow!" (or at least an "a-ha!") out of the solver in no more time than it takes to learn Othello five times!