Sudoku

Sudoku on GitHub

By Cell Quill editorial team Current release, published June 22, 2026

Puzzle Difficulty dialog showing SE rating and required sudoku solving techniques.
Difficulty dialog: SE rating and the solving techniques required for the selected sudoku puzzle. Sudoku C++ resources/screenshots from darkstar79/sudoku (GPL-3.0).

Sudoku C++ lives on GitHub as darkstar79/sudoku under GPL-3.0. Use the repository for source, issues, and the Releases list that feeds this puzzle install guide.

Open darkstar79/sudoku for the README and licence. Open Releases for zip, source tree, and AppImage files. Security reports: security.

What the repo holds

Source under src is GPL-3.0. Artwork under share is GPL-3.0 per the README. Screenshots used on this guide come from share/Screenshots. CMake build notes and package-manager doors (Flatpak release asset, FreeBSD, Flatpak) are documented in the README.

  • README install tables for AppImage, source tree, and Windows zip
  • How to play: presets, custom puzzles, keyboard
  • Compile steps with Qt6 dependencies

Stars and release cadence

Star counts and the latest tag come from the live fetch into gh.json at build time. Prefer the current stable tag that still ships Sudoku-*-win64.exe. Do not invent version numbers in copy.

Issues and contributions

Bug reports belong on the upstream Issues tracker. Cell Quill only publishes install guidance. Patch the client upstream when you find a real bug.

Licence summary

Client source: GPL-3.0 or later. Share artworks: GPL-3.0. Cite upstream when you redistribute screenshots. Site mark nine-cell is original Cell Quill geometry, not the upstream logo.

How this guide uses the repo

assetMatch regexes lock Windows win64 exe, macOS arm64 source build, and Linux AppImage. Releases page: releases. Safe download: download safe.

What GitHub is not

GitHub is not a Softonic mirror. Prefer the Releases asset names over third-party “download portal” portals. Home install panel: home.

Desk habits for the repo URL

Write the repo URL and the preferred filename on the machine ticket. After every reimage, open Releases again instead of trusting an old zip on a USB stick. Prefer Qt6 assets when both series ship.

Lab images should pin darkstar79/sudoku beside the OS version. Shared desks should refuse random forks that only rename the binary. Upstream remains the source of truth for Sudoku builds this guide maps.

When README package doors change, update RESEARCH.md before you change site.config.mjs. Flatpak, and FreeBSD remain UNVERIFIED on this review date even when the README lists them.

Shared desk checklist

  • One GitHub Releases URL on the ticket
  • One Qt6 asset name for this OS
  • One proven easy game after every reimage

Return to darkstar79/sudoku Releases when SmartScreen or Gatekeeper interrupts. Do not accept a second portal.

Lab and travel notes

Shared labs should treat the filename as part of the machine image. After every reimage, open GitHub Releases again, confirm the Qt6 asset still exists on the tag you pinned, and prove one short local game.

Travel laptops benefit from the same boring checklist: one installer door, one extract or Applications path, one note for the next bump.

  • Family PCs may keep Store Sudoku beside the client
  • Command-line users may add Flatpak after Releases works once
  • Document UNVERIFIED where a package command was not run here

Cell Quill publishes independent install guidance. Upstream the client remains GPL-3.0 at darkstar79/sudoku. Prefer phrase-first puzzle language in titles.

When assets change

When a release drops an OS asset, pause imaging work and re-check the live list. Prefer the next tag that restores your primary filename rather than inventing a new download brand.

Keyboard play, dark difficulties, and custom puzzles are comfort settings. They come after a proven game on easy. First-hour checklists exist so desks do not chase Options menus too early.

Filename discipline

Write the exact the client asset name beside the OS version before you image a lab. Prefer Qt6 when the tag ships both series so Windows zip desks match macOS source tree and Linux AppImage desks.

  • Sudoku-*-win64.exe on Windows
  • (no macOS release installer) on Apple silicon
  • Sudoku-*-x86_64.AppImage on Linux

No winget id and no Homebrew cask were found on this review date. Flatpak remain UNVERIFIED alternates documented upstream. Prefer Releases first.

After the first proven game

Only after one easy game works should you open Options for difficulties or try a custom puzzle. First hour: installed. First run: first run. Pencil marks: keyboard and difficulties.

Keep Microsoft Sudoku only if achievements still matter. Switch notes: switch. Comparison: vs Microsoft Sudoku. Safe download: download safe.

Cell Quill maps filenames. Upstream the client remains GPL-3.0 at darkstar79/sudoku. Refuse Softonic-style mirrors even when a first launch is blocked.