KEEPYBOO: Ghost Logic Puzzle
Deduction from numbers alone
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Find the ghosts hiding on the board from the numbers alone. Nothing is left to luck: all 2,000 puzzles solve by reasoning. 1,110 are free, and the first teaches you how.
Find the ghosts hiding on the board, using nothing but the numbers.
Nothing is left to luck. All 2,000 puzzles solve by reasoning, start to finish.
When you get stuck, a hint shows you why the next move is forced.
■ The rules
A number in a cell counts the ghosts in the eight cells around it.
A number at the edge of a row or column counts the ghosts in that line.
Mark the cells you've ruled out with an ×.
Reveal a cell with no ghost in it and you lose one of three lives.
Lose all three and you start the puzzle over — on the spot, nothing else lost.
That's everything. The first puzzle teaches you as you play it,
so you can start without reading any of this.
■ If you already know number-clue puzzles
The numbers read the way you expect. Very little else does.
· One wrong tap doesn't end the board (three lives, as above)
· Nothing is a coin flip. Every one of the 2,000 puzzles has been
checked to solve by reasoning alone, all the way to the end
· Rows and columns have totals too, so you can work the whole board
■ You don't have to be a maths person
The 160 EASY puzzles are built entirely from moves where a single number
tells you the answer. Higher sets add new kinds of move: comparing two
numbers, then assuming a ghost is somewhere and finding the contradiction.
The boards grow, but that isn't where the difficulty comes from.
Every technique is written up in the Tips library,
one at a time, illustrated on a real board.
■ Solve it, and a second puzzle opens
Come back to a puzzle you solved by pure deduction and the ghosts now show faintly.
The question is no longer where they are, but in what order to catch them.
On the same board, the order can change the score several times over.
Only the best order earns the diamond.
Finish one with no hints and no mistakes and you earn a crown.
Every one of the 2,000 puzzles can be solved, and then mastered.
■ 2,000 puzzles, ten sets
EASY, NORMAL, HARD, EXPERT and MASTER — 1,110 puzzles — are free.
Past those are EXTREME (690) and ULTIMATE (200),
and the first several puzzles of each are free to try.
A small board takes a few minutes; a large one takes as long as you like.
Every puzzle is saved on its own, so you can go a little at a time.
■ At your own pace, for the long run
No timer. Nothing that compares you with friends.
Take a break for a while — your progress and everything you've collected stay just as they were.
Just one puzzle today is fine.
It's a game for working through 2,000 puzzles, little by little, at your own speed.
■ The ghosts, and things to collect
Keepy, Mimo, Zuzu, Piri and Tobi.
They chatter away beside you while you think.
As you go, new wallpaper themes, sound sets and ghost friends join you.
Milestones in puzzles solved, diamonds and crowns, your Logic Rating —
more than 50 rewards mark the way on a long journey.
■ Ads and money
1,110 puzzles are free — no time limit, no play limit on any of them.
There are ads: occasional ones between rounds, and a video when you ask
for a hint. You can buy them away.
Everything is a one-time purchase. There is no subscription.
· EXTREME (690 puzzles)
· ULTIMATE (200 puzzles)
· Remove ads
■ Also
· Plays with no connection (only the ads need one)
· Progress backs itself up. Link an Apple or Google account and it follows you
to a new phone
· Available in 14 languages
Bit K.K. (Bit Corp.)
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• A Halloween gift: until October 31, receive the "Pumpkin Parade" sound set for free from News
• A short introduction when you get your Logic Rating, and a notice each time you beat your best
• Introductions to My history and the Random option
• Play Stats now shows your "World TOP n%"
• Small improvements
The developer, 株式会社ビット, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Location
- Contact Info
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Bit Corp.
- Size
- 85.5 MB
- Category
- Puzzle
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 13 more
- English, French, German, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish, Vietnamese
- Age Rating
9+
- 9+
- Infrequent
Horror/Fear Themes
Contains
Advertising
- In-App Purchases
Yes
- Sound: 80s Ghost $0.99
- Sound: Water Drops $0.99
- Sound: Koto Strings $0.99
- Theme: Pixel Castle $0.99
- Theme: Comic Hero $0.99
- Theme: Toy Box $0.99
- Theme: Halloween $0.99
- ULTIMATE Pack $1.99
- EXTREME Pack $3.99
- Remove Ads $4.99
- Copyright
- © 2026 Bit Corp.