# Σ-Sigma — for Killer Sudoku Expert

> for Killer Sudoku Expert (iPhone/iPad app by Hiroe Oshimura.)

- Source: https://appshunter.io/ios/app/sigma/id6760932175 (this page in markdown: same URL + `.md`)
- Developer: [Hiroe Oshimura](https://appshunter.io/developer/1592216886)
- Category: Games, Utilities, Puzzle, Strategy
- Price: $0.99
- Age rating: 4+
- Requires: iOS 13.0 · 18 MB
- Languages: American English
- Released: 2026-03-24
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/sigma/id6760932175/reviews.md

## What is Σ?

Σ is a logic support tool designed for solving Killer Sudoku cages.

Enter the target sum, number of cells, excluded digits, and required digits. The app instantly generates all valid combinations that match your conditions. No more manual calculations—focus on logic and move forward efficiently.

■ Key Features
• Generate combinations from cell count and sum
• Filter using excluded and required digits
• View all possible sets instantly
• Support for the 45 rule (total sum strategy)
• Clean and intuitive interface

■ Who it’s for
• Killer Sudoku players
• Advanced puzzle solvers
• Anyone who prefers logical deduction over guesswork

■ Concept
Σ is not a solver.
It is a thinking tool.

It clears your view, organizes possibilities, and helps you focus on logic.

Handle complex cages with confidence.
See all options at once and find the shortest path to the solution.


## Version history (last 1 release)

### 1.0 — 2026-03-24

No release notes.

## More apps by Hiroe Oshimura

- [はじめてのえにっき](https://appshunter.io/ios/app/id1592216614)
- [when-where-what-database](https://appshunter.io/ios/app/when-where-what-database/id6502634868)
- [Chronomap in Cosmos](https://appshunter.io/ios/app/chronomap-in-cosmos/id6642644551)
- [Chronomap in Maritime](https://appshunter.io/ios/app/chronomap-in-maritime/id6738851225)
- [Scatter3D Maker](https://appshunter.io/ios/app/scatter3d-maker/id6746820074)
- [DoDon](https://appshunter.io/ios/app/dodon/id6753098478)

All apps by Hiroe Oshimura: https://appshunter.io/developer/1592216886

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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 2026-08-31.*