# K.O. Sudoku - Sudoku Solver — Sudoku Game, Tutorials, Answer

> Extensive Sudoku puzzle variety with solver, tutorials, and photo input. (iPhone/iPad app by 又瑞 韦.)

- Source: https://appshunter.io/ios/app/ko-sudoku-sudoku-solver/id1625864447 (this page in markdown: same URL + `.md`)
- Developer: [又瑞 韦](https://appshunter.io/developer/1625836878)
- Category: Entertainment, Utilities
- Price: Free with in-app purchases
- Rating: 4.30/5 from 7 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 71 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2022-05-26
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/ko-sudoku-sudoku-solver/id1625864447/reviews.md

## What is K.O. Sudoku?

Various types sudoku puzzles, answers, step-by-step explanations, allow take photo to input.
It supports 3/4/5/6/7/8/9/10/12/15/16 grid sudoku, irregular sudoku, killer sudoku, kendoku, skyscrapers sudoku, thermo sudoku, arrow sudoku, clone sudoku, odd/even sudoku, palindrome sudoku, sandwich sudoku, little killer sudoku, inequality sudoku, fortress sudoku, tripod sudoku, between sudoku, German whispers sudoku, slanted-lines sudoku, odd-even capsules sudoku, kropki sudoku, outside sudoku, battenburg sudoku, consecutive sudoku, quad max sudoku, clock face sudoku, clock sudoku, quadruple sudoku, exclusion sudoku, star product sudoku, next to 9 sudoku, Rossini sudoku, x-sums sudoku, search 6 sudoku, search 9 sudoku, odd-even minesweeper sudoku, wheels sudoku, rhombus sudoku, odd-even lines sudoku, anti-diagonal sudoku, triangle sums sudoku, slanted # sudoku, eliminate sudoku, slow thermo sudoku, renban sudoku, diagonal inequality sudoku, parity lines sudoku, point to next sudoku, odd path sudoku, trench sudoku, diagonal consecutive sudoku, OEBS sudoku, descriptive pairs sudoku, numbered rooms sudoku, first odd/even sudoku, rougamo sudoku, sum max min sudoku, distance sudoku, even sandwich sudoku, next to 6 sudoku, bouncing x-sums sudoku, x-th sum sudoku, pointing evens sudoku, diagonal outside sudoku, big-small sudoku, VX sudoku, 56 sudoku, irregular dots sudoku, consecutive pairs sudoku, add/sub sudoku, self joint sudoku, necklace sudoku, blackout sudoku, one more num sudoku, snow sudoku, hexagonal sudoku, curve sudoku, tridoku, hoshi sudoku, 4x4 ring sudoku, half sudoku, honeycomb sudoku, 3D sudoku, cube sudoku, pentagram sudoku, penrose triangle sudoku, 3D windmill sudoku, overlapping sudoku, samurai sudoku, twodoku, triple doku, flower sudoku, windmill sudoku, gattai-3 sudoku, butterfly sudoku, cross sudoku, sohei sudoku, W sudoku, gattai-5 sudoku, gattai-13 sudoku, star sudoku, extra regions sudoku, diagonal sudoku, windoku, offset sudoku, percent sudoku, asterisk sudoku, girandola sudoku, center dot sudoku, pyramid sudoku, product sudoku, ratio sudoku, addition sudoku, subtract sudoku, round off sudoku, sum or difference sudoku, mathdoku, zero sudoku, prime sudoku, sum dot sudoku, inclusion sudoku, diagonal XV pairs sudoku, sum-product VX sudoku, greater sudoku, consec-ineq sudoku, BMS sudoku, sum frame sudoku, big-small sudoku, odd sudoku, even sudoku, balanced sudoku, non-consecutive sudoku, no touch sudoku, anti-knight sudoku, anti-bishop sudoku, no-four sudoku, connected irregular sudoku, scattered sudoku, shape sudoku, letter-map sudoku, etc.
There are also technique tutorials and a rich online sudoku store.
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K.O. mode: Provide the solution directly.
Help mode: Provide step-by-step explanations.
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Sudoku Rules: Fill in the 9x9 grid with numbers 1~9 such that each row, column, and 3x3 box contains each number exactly once.
Irregular Sudoku: Each row, column, and irregularly shaped box contains no repeating digits.
Killer Sudoku: Combines classic Sudoku rules with "killer cages" (dashed-line groups). Each cage shows a sum for its digits, which must also be unique within the cage.
Kendoku: Fill an n x n grid with digits 1-n (no repeats per row/column). Groups marked by thick lines show a target number and operation (+, -, ×, ÷) that their digits must satisfy. If no operator is given, any operation applies.
Skyscraper Sudoku: Perimeter clues showing visible building counts (taller numbers block smaller ones), while unmarked sides remain unrestricted.
3D Sudoku: Each 3x3 box, as well as the 9 cells along each colored line, contain unique, non-repeating digits.
Samurai Sudoku: Satisfying the classic Sudoku rules in each of the five independent regions.

## Key features

- Vast Sudoku puzzle variety
- Multiple grid sizes and rule sets
- Photo input for puzzles
- Step-by-step solution explanations
- Technique tutorials
- Online Sudoku store

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Quiz Pass 365 days | $19.99 | one-time |
| Vip 30 days | $0.99 | one-time |
| Quiz Pass (30 days) | $1.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/ko-sudoku-sudoku-solver/id1625864447/reviews.md

### 4/5 — 很好但有点小bug

*2025-11-04*

有时候肯肯数独的四则运算符号显示不出，只有数字，删除重装会变好

**Developer response:** 你好，肯肯数独里没有运算符号的话，表示可以用 加减乘除 任一运算哦，可参见题型“玩法说明”

### 1/5 — Not in English!

*2024-12-08*

Not sure how we’re supposed to use this if nothing is in English.

**Developer response:** v3.9.6 already use device language as app's default language, please upgrade.
Sorry, previous app defaults to Chinese. You can switch the language to English on the "About" page (the last tab button at the bottom of the homepage).

## Frequently asked questions about K.O. Sudoku

### What types of Sudoku puzzles does K.O. Sudoku offer?

K.O. Sudoku supports an extensive range of Sudoku variations, including standard 9x9, irregular, killer, kendoku, skyscrapers, thermo, arrow, and many more. The app boasts over 100 different Sudoku types.

### Can K.O. Sudoku solve puzzles from a photo?

Yes, K.O. Sudoku allows you to input puzzles by taking a photo. This feature makes it convenient to digitize and solve physical Sudoku puzzles you encounter.

### Does K.O. Sudoku provide help for difficult puzzles?

K.O. Sudoku offers a 'Help mode' that provides step-by-step explanations for solving puzzles. This is ideal for learning new strategies and understanding complex Sudoku variations.

### Is K.O. Sudoku suitable for beginners?

With its tutorials and step-by-step explanations, K.O. Sudoku is suitable for beginners. The app also offers a 'K.O. mode' to directly provide solutions for those who prefer to see the answer.

### What is the age rating for K.O. Sudoku?

K.O. Sudoku has an age rating of 4+, making it appropriate for a wide range of users, including children and adults interested in logic puzzles.

### Does K.O. Sudoku have ads?

Yes, K.O. Sudoku contains advertisements. Users may encounter ads while using the app.

### How often is K.O. Sudoku updated?

The latest version of K.O. Sudoku is 4.9.80, last updated on March 31, 2026. This indicates a recent update, suggesting ongoing development and support.

### What devices can I play K.O. Sudoku on?

K.O. Sudoku is available on iPhone, iPad, and iPod devices, offering a versatile gaming experience across Apple's mobile ecosystem.

## Version history (last 5 releases)

### 4.10.10 — 2026-08-20

Add mathdoku

### 4.10.9 — 2026-08-11

Add self joint sudoku

### 4.10.8 — 2026-08-09

Add greater sudoku

### 4.10.7 — 2026-07-19

Add pointing evens sudoku, diagonal outside sudoku, big-small sudoku

### 4.10.6 — 2026-07-15

Add odd path sudoku, bouncing x-sums sudoku

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## More apps by 又瑞 韦

- [K.O. Nonogram](https://appshunter.io/ios/app/ko-nonogram/id1626831214)
- [K.O. Flip - Light up](https://appshunter.io/ios/app/ko-flip-light-up/id1627027420)
- [K.O. Slitherlink](https://appshunter.io/ios/app/ko-slitherlink/id1629925581)
- [K.O. Sudoku Pro](https://appshunter.io/ios/app/ko-sudoku-pro/id6479217148)
- [K.O. Nonogram Pro](https://appshunter.io/ios/app/ko-nonogram-pro/id6737248261)

All apps by 又瑞 韦: https://appshunter.io/developer/1625836878

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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 2026-08-23.*