# KEEPYBOO: Ghost Logic Puzzle — Deduction from numbers alone > Deduction from numbers alone (iPhone/iPad app by 株式会社ビット.) - Source: https://appshunter.io/ios/app/keepyboo-ghost-logic-puzzle/id6813510087 (this page in markdown: same URL + `.md`) - Developer: [株式会社ビット](https://appshunter.io/developer/6813510089) - Category: Games, Board, Puzzle - Price: Free with in-app purchases - Age rating: 9+ - Requires: iOS 15.0 · 80 MB - Languages: American English, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, European Portuguese, Russian, Chinese (Simplified, China) and 4 more - Released: 2026-09-24 - Data updated: 2026-09-28 - User reviews in markdown: https://appshunter.io/ios/app/keepyboo-ghost-logic-puzzle/id6813510087/reviews.md ## What is KEEPYBOO? 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.) ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Remove Ads | $4.99 | one-time | | EXTREME Pack | $3.99 | one-time | | ULTIMATE Pack | $1.99 | one-time | | Theme: Halloween | $0.99 | one-time | | Theme: Toy Box | $0.99 | one-time | | Theme: Comic Hero | $0.99 | one-time | | Theme: Pixel Castle | $0.99 | one-time | | Sound: Koto Strings | $0.99 | one-time | | Sound: Water Drops | $0.99 | one-time | | Sound: 80s Ghost | $0.99 | one-time | ## Version history (last 2 releases) ### 1.164.55 — 2026-09-26 • "Diamond hint" now works on all 2,000 puzzles: on a puzzle you've solved flawlessly, a lamp shows whether the diamond is still within reach • 20 new rewards (themes and sound sets), earned through total clears, milestones in each set, diamonds, streaks and Logic Rating • Paid pack cards and the purchase screen now list every reward you can earn • Streak reminder: with a 3-day streak or more, one notification on a day it's about to end (pick any time; we ask once, and never again if you decline) • Top players now see their Logic Rating and lifetime completion as a world rank • A special celebration when you earn a skull (proven minimum score) • Pick your next round yourself right after clearing • Added "Tell a friend" to Settings • Small improvements ### 1.164.28 — 2026-09-24 No release notes. ## Apps similar to KEEPYBOO | App | Rating | Price | Category | | --- | --- | --- | --- | | [Missing Digits: Math Puzzle](https://appshunter.io/ios/app/missing-digits-math-puzzle/id6799607537) | — | Free | Games | | [LOGICA Puzzle: Logic Grid Game](https://appshunter.io/ios/app/logica-puzzle-logic-grid-game/id6782219365) | — | Free | Games | | [Edo Logic~Zebra Logic Puzzle~](https://appshunter.io/ios/app/edo-logiczebra-logic-puzzle/id6787479937) | — | Free | Games | | [Pieceful Jigsaw Puzzle](https://appshunter.io/ios/app/pieceful-jigsaw-puzzle/id6783817020) | 5.0 (2) | Free | Games | | [Detective Doku](https://appshunter.io/ios/app/detective-doku/id6791519778) | 4.7 (3) | Free | Games | | [Jester Logic: Crowns Puzzle](https://appshunter.io/ios/app/jester-logic-crowns-puzzle/id6760729484) | 5.0 (2) | Free | Games | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-28.*