# NazoRaku - Cipher Puzzles

> Solve it. Understand ciphers.

Canonical page: [https://chrome-stats.com/d/id6777664655](https://chrome-stats.com/d/id6777664655)

## Overview

- **ID:** `id6777664655`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Fuji Bit Inc.
- **Category:** Puzzle
- **Version:** 1.0
- **Last updated:** 2026-06-09
- **First published:** 2026-06-09
- **Size:** 4.69 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/nazoraku-cipher-puzzles/id6777664655)
- **Website:** [https://nazoraku.fujibit.com](https://nazoraku.fujibit.com/)
- **Privacy policy:** [https://nazoraku.fujibit.com/en/privacy.html](https://nazoraku.fujibit.com/en/privacy.html)

## Description

Ciphers, solved by playing. Crack classic and modern ciphers from Caesar to RSA and hashing—work out the key, use frequency analysis, then learn how each works.

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.

## Rankings

- #1,862,372 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6777664655)