# Shikirei: Math Formula Puzzle — Turn equations into machines

> Turn equations into machines (iPhone/iPad app by SNAPLACE.)

- Source: https://appshunter.io/ios/app/shikirei-math-formula-puzzle/id6802468634 (this page in markdown: same URL + `.md`)
- Developer: [SNAPLACE](https://appshunter.io/developer/6790258232)
- Category: Education, Games, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 103 MB
- Languages: American English, Japanese
- Released: 2026-11-10
- Data updated: 2026-11-11

## What is Shikirei?

MOVE THE WORLD WITH EQUATIONS

In this book, an equation is not a question to fill in. It is a mechanism to operate.

Place gates where a parabola meets the ground and send a beam of light to the lighthouse. Choose how the sides of a triangle are divided and see whether three lines meet at one point. Add two waves and match their amplitude and phase.

You never pick an answer from choices. Drag the controls, enter values, and press Observe to see where the light actually lands and which condition was broken. Predict, observe, adjust. There is no attempt limit.

51 UNITS, 153 STAGES

Math I, A, II, B, C and III, with an introductory, an applied and a challenge stage in every unit. Twenty kinds of devices: gates at the zeros of a curve, rods with square-root lengths, probability branches you open and count, gears, waves, tangent lines, integral channels and more. Challenge stages add a resource budget, and some add obstacles and a required order.

- Math I: quadratic functions, radicals, sets, trigonometric ratios, data analysis
- Math A: counting and probability, conditional probability, geometry, integers
- Math II: expressions and proofs, figures and equations, trigonometric functions, exponents and logarithms, differentiation and integration
- Math B: sequences, recurrence relations, statistical inference
- Math C: vectors, the complex plane, conic sections
- Math III: limits, differential calculus, integral calculus

Each unit covers representative topics. This is not a complete collection of every exam question type.
The content follows the Japanese high school mathematics curriculum, so some topics and terms may differ from your course.

WORKED EXAMPLES AND ADVICE

- Open the reasoning on the board
- Step through a worked example that shows each action and value (it grants no reward while you watch)
- Ask the stage's spirit for a way of looking at the problem rather than the answer
- Undo and reset are always available

A SECOND MODE: THE UNIVERSE BOOK

60 algebra problems across 11 layers. Each card shows only the name of a technique, such as completing the square, and you compute the numbers in (x + ?)(x + ?) yourself. Answers are checked by expanding back to the original expression, so any valid order of steps is accepted.

TECHNIQUES BECOME CHARACTERS

Sixteen spirits, plus your guide Shiori, each with full-body art and three expressions. Their personalities come from real mathematics: Differentiation and Integration are siblings because of the fundamental theorem of calculus. In this world, fog is what has not yet been proven, and every restored equation clears a little of it.

- Meet a spirit the first time you clear its stage
- The compendium opens each spirit's own explanation of the technique and a bond episode

PRICING

The first 4 units of the Observation Journey (12 stages) and the first three layers of the Universe Book (12 problems) are free, with every feature enabled.
A single one-time purchase unlocks the remaining 141 stages and 48 problems.
If you purchased before, all 153 stages stay open.

- No additional charges
- No subscriptions
- No ads
- No gacha
- No stamina

WHO IT IS FOR

- You want to feel what a formula actually represents
- You memorized the formulas but do not know when to use them
- You want to start math in the spare minutes before sitting down at a desk
- You keep going when there are characters

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock all layers | $2.99 | one-time |


## Is Shikirei safe?

Not enough ratings yet to assess Shikirei.

## Is Shikirei legit?

Shikirei: Math Formula Puzzle appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Shikirei is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.1.1 — 2026-11-07

Shikirei now speaks English. The whole game follows your device language.

### 1.1 — 2026-11-06

Shikirei now speaks English. The whole game follows your device language.

Clear screen now explains the result
Added "Goal achieved" and "In other words" so the answer is tied back to the question.

Fixes
- Less drawing while idle; decorations pause after 30 s without input (heat and battery)

### 1.0.1 — 2026-10-10

■ 答えの意味が分かるように
クリア画面に「目標 達成」と「つまり」を足しました。
答えの式だけでなく、そこから何が読み取れるのかを言葉で結びます。

■ 直したこと
・何もしていないときの描画を減らし、30秒触らなければ飾りが止まるようにしました(発熱・電池対策)

### 1.0 — 2026-10-08

No release notes.

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All apps by SNAPLACE: https://appshunter.io/developer/6790258232

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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 2026-11-11.*