Boo Who? FAQ
Short answers about Boo Who?, the cozy ghost logic puzzle with a new case every day.
What is Boo Who?
Boo Who? is a free, cozy logic puzzle that you play in your browser. You place ghosts on a haunted-house map, one per row and one per column, so that every clue holds true. The ghost left alone with Boo is the culprit. Think sudoku with a tiny ghostly whodunit, and nothing scary.
Why is it called Boo Who?
Because every case asks one question: Boo got spooked – but by who? And yes, it is also the knock-knock joke. Don't cry, it's only a puzzle.
Is Boo Who? free? Do I need an account?
Yes, it is free, and there is no account and no sign-up. Today's case, the three days before it and the tutorial are open to everyone. Just open the page and play.
When does the new case come out?
Every day at midnight, your local time. Everyone plays the same case on the same day. Once you have solved it, the game counts down to the next one.
How do I learn to play?
Play the tutorial: a tiny case with a guide ghost that teaches the rules in about two minutes. The game offers it on your first visit, and the “?” button next to the case number opens it any time. The rules are also written out on the How to play page.
How hard are the cases?
Every case has exactly one solution, and you can always reach it by logic alone – you never have to guess. The daily cases are gentle for now.
Can I play past cases?
Yes. Today's case and the three days before it are open to everyone: tap the case number, for example “Case #12”, to open the calendar. Older cases will come with the full archive, which is on its way.
Is my progress saved?
Yes, after every move, in your browser on this device. There is no account, so your progress does not move to other devices, and clearing the browser's data for this site deletes it. Safari may also clear it after about a week without a visit.
What is the candle next to the case number?
Your streak: the number of days in a row on which you solved the case on its own day. A case you have not solved yet today never breaks it, but a missed day does. Past cases from the calendar do not count.
Does Boo Who? work on my phone?
Yes. It is made for phones first and works in any modern browser, on phones, tablets and computers. There is nothing to install. On a phone, hold it upright.
Is Boo Who? suitable for kids?
Yes. Nobody gets hurt: the mystery is a spooking, not a crime, the ghosts are cute, and there are no ads and no chat. The two-minute tutorial teaches the rules by playing.
How is it different from sudoku?
Boo Who? keeps sudoku's best rule – never two in the same row or column – but there are no numbers. The clues are about places and ghosts, like “Mochi was at the piano.”, and the answer is a name: who spooked Boo.
Who makes Boo Who?
Boo Who? is an independent game, made by one developer in Germany. You will find the contact details in the Impressum.