# Karakuri Vault - Puzzle Book — 22 puzzles: open, close, tilt

> 22 puzzles: open, close, tilt (iPhone/iPad app by tasuku nayuki.)

- Source: https://appshunter.io/ios/app/karakuri-vault-puzzle-book/id6820049667 (this page in markdown: same URL + `.md`)
- Developer: [tasuku nayuki](https://appshunter.io/developer/1896779740)
- Category: Games, Adventure, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 5 MB
- Languages: American English, Japanese
- Released: 2026-10-22
- Data updated: 2026-10-23

## What is Karakuri Vault?

A puzzle game that turns your foldable iPhone into Grandfather's karakuri book — a hollow book that is secretly a safe. The closed outer screen is the cover, the left and right sides of the open inner screen are the spread, and the fold is the book's gutter. How you handle the book is the puzzle. 22 puzzles in all.

■ The hinge is the dial
• Opening the book moves a needle across marks 1–9. Hold still for 0.7 s to set a number.
• You align by watching the needle, so you never need to know exact angles. A tiny click marks every step.
• The final vault is entered like a real safe: open, close, open — turning back at each number.

■ Puzzles made of book physics (a few of them)
• Close the book to make it dark, and glow-in-the-dark paint reveals a number.
• Close over a wet printing plate and the ink presses onto the right side — mirrored.
• A loose stencil flips onto the other side every time the book shuts.
• Tiny words written in the gutter can only be read when the book lies flat.
• A sleeping moth spreads its wings only if you open the book gently.
• A revolving lantern's shadows only show in the dark of a barely open book.
• Tuck in a medal, close the book, and rub the paper to raise a rubbing.
• Watermarks show when you see the sheets from behind — from the cover side.
• While the book is closed, nights pass and the moon waxes and wanes in the skylight on the cover.
• The left and right sides are hinged mirrors: the angle sets how many petals you see.
• Tilt the book toward closed and sand pours from the left side onto a scale on the right.
• A key placed on the left side meets its mirror position on the right when the book closes.
• The bell can only be heard on the cover side of the closed book. Plus shadow figures, a music box, fanning away dust, and standing the book up as a ramp for a marble.

■ A prologue, four rooms, 22 puzzles
• The Cover → Grandfather's Study → The Print Shop → The Clock Tower → The Vault. The later rooms get harder.
• Progress saves automatically after every puzzle. Start over from the menu at any time.
• Pick any solved puzzle from the contents to play it again — your progress stays as it is.

■ Fair puzzles, fair hints
• A red stamp marks every object that needs a motion (close, open flat, open slowly, open a crack, tilt to pour, look at the cover, fan, stand it up and more).
• Hints come in three steps — which motion, where to look, the answer — and you can open them as often as you like. No ads to watch.
• Clues you've seen are written in your notebook automatically.
• Sound puzzles always have a visual alternative.

■ Hand-drawn, flat art and live sound
• Old paper and ink, red seals and flat gold. Page rustles, gears, bells and sand are synthesized on the device, with haptics.

■ On other iPhones
• Designed for the hinge, but on other iPhones you open and close the book by dragging the open/close strip, and every puzzle can be solved.

■ Data
• Progress is stored only on this device. No account needed.

■ Pricing
• Free. Ads appear after you clear a chapter and at the bottom of the menu — never while solving or on the cover screen.
• If an ad can't load, the game never stops.
• A one-time "Remove Ads" purchase turns them off.

Terms of Use: https://nayukitecture.com/works/duo-safe-terms-of-use.html

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Is Karakuri Vault safe?

Not enough ratings yet to assess Karakuri Vault.

## Is Karakuri Vault legit?

Karakuri Vault - Puzzle Book appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Karakuri Vault is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-23

No release notes.

## More apps by tasuku nayuki

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- [マドリモ - 部屋の間取りをメモする](https://appshunter.io/ios/app/id6808868188)
- [定点撮影 - 三脚不要な定点カメラ](https://appshunter.io/ios/app/id6808869344)
- [建築電卓 - 尺貫法・坪・帖の換算](https://appshunter.io/ios/app/id6809843490)
- [カメリーノ - 手持ちの服でコーデを試す](https://appshunter.io/ios/app/id6810034871)

All apps by tasuku nayuki: https://appshunter.io/developer/1896779740

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*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 2026-10-23.*