---
title: "On-Core Sudoku — App Overview"
url: https://marlvel.ai/intel-report/games/on-core-sudoku
category: Games
developer: On-Core Software LLC
platforms: ios
rating: 5.0 (1 ratings)
pricing: paid
report_level: overview
generated: 2026-04-27
last_verified: "2026-04-27T11:23:32.820Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a paid, feature-focused Sudoku utility designed for users who prioritize customization and advanced solving tools over a free-to-play model.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Games |
| Rating | 5.0 ★ (1) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 1.6 |
| Developer | On-Core Software LLC |

<!-- SECTION: Summary -->
## What is On-Core Sudoku?

On-Core Sudoku is a mobile puzzle application that provides randomly generated nine-by-nine Sudoku grids with adjustable difficulty levels. It includes utility tools such as error checking, pencil marking, and unlimited undo/redo functionality to assist players in solving puzzles.

<!-- SECTION: Key Features -->
## Key Features

- **Customizable Difficulty**: Offers Easy, Medium, Hard, and Custom difficulty settings with individual timers for each level.
- **Puzzle Assistance Tools**: Includes error checking for invalid entries, pencil marking for annotations, and an autofill option for potential candidates.
- **Game Management**: Supports auto-saving, unlimited undo/redo moves, and the ability to generate both symmetric and non-symmetric puzzles.
- **Custom Input**: Allows users to manually input puzzles from external sources like newspapers.

<!-- SECTION: Target Audience -->
## Who is it for?

Casual puzzle enthusiasts looking for a customizable and feature-rich Sudoku experience.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/on-core-sudoku/id287314682?uo=4)
- [Full Intelligence Report](https://marlvel.ai/intel-report/games/on-core-sudoku)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/games/on-core-sudoku).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*