# STutor

> Sudoku solver app with logical strategies, hints, and puzzle management. (iPhone/iPad app by Robert Carlson.)

- Source: https://appshunter.io/ios/app/stutor/id714298825 (this page in markdown: same URL + `.md`)
- Developer: [Robert Carlson](https://appshunter.io/developer/714298828)
- Category: Games, Education, Puzzle
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2013-10-01
- Data updated: 2026-06-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/stutor/id714298825/reviews.md

## What is STutor?

STutor (for SUDOKU TUTOR) is a no-nonsense sudoku solving APP that can display three level of hints while you are solving a puzzle.  There are no AD's; no "in-APP-purchases".  Just a program to help you advance your Sudoku solving skills.

STUTOR solves puzzles using 5 strategies following a logical sequence of methods. The sequence and methods are described in five (5) HELP screens.  

STUTOR is most appreciated when it displays clues for solving those pesky Friday/Saturday more advanced puzzles.  No more disappointing unsolved puzzles.

Puzzles are entered manually in a Sudoku grid or by entering (or pasting) an 81 character string.  Puzzles can be saved, recalled, changed, deleted, and reordered in the Archive.

Upon pressing any of the bottom buttons (except clr), STUTOR will validate and solve the puzzle.  Any subsequent user entries will be compared with the solution.  A valid entry is entered into the puzzle.  If the entry does not correspond to the solution, all the "possibles" or minis are displayed for that cell.  If minis are already displayed, the entered number is removed from the minis.

Swiping more that two cells in a row will display minis in the row.  Ditto for a column or a group.  Swiping through more than two rows, columns or groups will display all minis.

The "hint" button toggles between a text only hint and one that also displays a clue on the puzzle. The STEP button displays all hint details and alters the puzzle accordingly.

## Key features

- Three levels of hints
- Five logical solving strategies
- Manual puzzle entry
- 81-character string input
- Puzzle saving and management
- Entry validation against solution
- Display of possible numbers

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stutor/id714298825/reviews.md

### 5/5 — Best Sudoku-solving app out there

*2013-11-09*

Truth be told, I'm not much of a Sudoku fan, as I've never really appreciated the mechanics of the puzzles. My wife, however, is a big fan, and I bought this app to figure out why she's so enthralled with these puzzles. I like the step-by-step approach it provides in terms of hints, and I also like that it never spoon feeds you the solutions. For under $1, you can't go wrong with this app.

## Frequently asked questions about STutor

### Does STutor have ads?

No, STutor is advertised as having no advertisements, providing an uninterrupted solving experience.

### How much does STutor cost?

STutor is a paid app, available for a one-time purchase of $0.99.

### What devices does STutor support?

STutor is designed for iPhone and iPod devices.

### How does STutor help with difficult puzzles?

STutor is particularly useful for advanced puzzles, offering clues and step-by-step solutions to help users complete them.

### Can I save my Sudoku puzzles in STutor?

Yes, STutor allows you to save, recall, change, delete, and reorder puzzles within its Archive feature.

### What happens if I enter an incorrect number in STutor?

If an entry does not correspond to the solution, STutor will display the 'possibles' or minis for that cell, or remove the incorrect number from the minis if they are already shown.

### How often is STutor updated?

The latest version of STutor is 3.1, last updated on November 8, 2023, indicating regular maintenance and updates.

### What age rating is STutor?

STutor has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 3.1 — 2023-11-08

Minimum deployment of  IOS 13.0.

### 3.0 — 2020-08-24

Upgraded to Swift, added recursive solution at ASSUME method.

### 2.0 — 2018-05-04

Added TWINS and moved Unique Rectangle method befor Y method

### 1.3 — 2015-06-10

Added method "XYZ"
corrected minor bugs

### 1.2 — 2014-01-27

Updated to iOS 7.
Fixed bug in “Assume” method. 
Enhanced Unique Rectangle to eliminate more possibilities.
Wider user entry numpad; added “tock” and "claps" sounds.

## Apps similar to STutor

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Super Mega Lucky Box](https://appshunter.io/ios/app/super-mega-lucky-box/id1659903900) | 4.2 (11) | $2.99 | Games |
| [Rainbow Drop Casual](https://appshunter.io/ios/app/rainbow-drop-casual/id6477760513) | 4.8 (5) | Free | Games |
| [Sudoklue](https://appshunter.io/ios/app/sudoklue/id1549550293) | 4.8 (66) | $7.99 | Games |
| [Minesweeper: Modernized](https://appshunter.io/ios/app/minesweeper-modernized/id1099108450) | — | Free | Games |
| [Sudoku - Numbers Logic Puzzle](https://appshunter.io/ios/app/sudoku-numbers-logic-puzzle/id6498925866) | 4.9 (19) | Free | Games |
| [Sudoktor](https://appshunter.io/ios/app/sudoktor/id673673295) | 3.0 (6) | $0.99 | Games |

## More apps by Robert Carlson

- [Golf Skins II](https://appshunter.io/ios/app/golf-skins-ii/id1138994696)
- [Prescott Plaza](https://appshunter.io/ios/app/prescott-plaza/id1249738762)
- [Camera Sudoku](https://appshunter.io/ios/app/camera-sudoku/id1492350871)

All apps by Robert Carlson: https://appshunter.io/developer/714298828

---

*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 2026-06-07.*