# NazoRaku - Cipher Puzzles — Solve it. Understand ciphers.

> Solve it. Understand ciphers. (iPhone/iPad app by Fuji Bit Inc..)

- Source: https://appshunter.io/ios/app/nazoraku-cipher-puzzles/id6777664655 (this page in markdown: same URL + `.md`)
- Developer: [Fuji Bit Inc.](https://appshunter.io/developer/1874205957)
- Category: Games, Education, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English, Japanese
- Released: 2026-06-09
- Data updated: 2026-07-05
- User reviews in markdown: https://appshunter.io/ios/app/nazoraku-cipher-puzzles/id6777664655/reviews.md

## What is NazoRaku?

A puzzle game where you UNDERSTAND ciphers by solving them - not by reading about them.
From the Caesar cipher to RSA and hashing, crack classic and modern ciphers one stage at a time, and the way each cipher works clicks into place. Slide to find the key, spot letters with frequency analysis, reverse-lookup a grid - relive that "aha" moment of decryption again and again.

[ Classic ciphers - free, 40 puzzles ]
- Caesar (10) - Shift letters; work out the shift from the crib and enter it
- Vigenere (10) - Polyalphabetic with a keyword; guess the key
- Substitution (8) - One-to-one swap; crack it with frequency analysis
- Transposition (6) - See through the reordering
- Polybius Square (6) - Letters to numbers via a 5x5 grid; reverse-look up

[ Modern ciphers ]
- XOR (6) - Exclusive OR; XOR with the key to recover the text (free)
- Public-Key (RSA, simplified) - Lock with the public key, find the message
- Hash Function - Feel one-wayness; find an input that collides to the same output
- Block Cipher (AES-style) - Step through add-key, substitute, and permute rounds

[ Features ]
- Explanation right after you solve - history, real-world usage, weaknesses, and the bridge to modern tech
- Staged hints - a free recap first, then gradual reveals when stuck (keeps the "I solved it" feeling)
- No ads at all while you are solving a puzzle - designed to preserve focus
- Achievement badges and stats for collection
- Universal app for iPhone and iPad
- Japanese and English (UI, puzzle text, and hints; follows the device language)
- Ciphertext shown beautifully in a monospaced font

[ Who is this for ]
- Anyone who loves puzzles and riddles
- Students and engineers curious about cryptography and security
- People who want quick brain-training in spare moments

[ Part of the Raku Series ]
The third information-systems title of the Raku Series. Knowledge from ARURAKU (algorithms) and DATARAKU (data structures) pays off in NazoRaku's decryption - hashing and modular exponentiation tie ciphers back to the fundamentals.

[ Note on pricing ]
Free to play. All classic-cipher stages and the modern-cipher intro are free. Hints, ad removal, the Modern Cipher Pack, and an all-in-one Premium are available as in-app purchases. No ads are ever shown while you are solving a puzzle.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 1 Hint Ticket | $0.99 | one-time |
| 10 Hint Tickets | $5.99 | one-time |
| Remove Ads | $3.99 | one-time |
| Modern Cipher Pack | $5.99 | one-time |
| Premium (All-in-One) | $14.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-06-09

No release notes.

## More apps by Fuji Bit Inc.

- [SUUGAKU](https://appshunter.io/ios/app/suugaku/id6759102221)
- [BUTURAKU](https://appshunter.io/ios/app/buturaku/id6759213255)
- [PAKEDOU](https://appshunter.io/ios/app/pakedou/id6759820254)
- [OKURERUNA！](https://appshunter.io/ios/app/okureruna/id6759956971)
- [HARAKU](https://appshunter.io/ios/app/haraku/id6759958253)
- [KORAKU](https://appshunter.io/ios/app/koraku/id6760215571)

All apps by Fuji Bit Inc.: https://appshunter.io/developer/1874205957

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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 2026-07-05.*